A fuse is a device designed to break a circuit, usually by melting when the current exceeds a certain value. Fuses are widely used in electronic equipment, but have been replaced by circuit breakers in household wiring. In the "old days" people would sometimes replace a blown fuse with a penny, which happened to be the same size as a fuse. Was this a safe practice? Why

High-voltage power supplies are sometimes designed to have a rather large internal resistance as a safety precaution. Why is such a power supply with a large internal resistance safer than one with the same voltage, but lower internal resistance?

Can all combinations of resistors be reduced to series and parallel combinations?

Old-time Christmas tree lights had the property that, when one bulb burned out, all the lights went out. How are these lights connected, in series or in parallel? How could you rewire them to prevent all the lights from going out when one of them burned out?

Quote Receiver overload is common type of interference .It happens most often to consumer electronic equipment near transmitter.When the RF signal ( at the fundamental freqency ) enters the receiver it overloads one or more circuits.The receiver front end ( first the RF amplifier stage after the antenna ) is most commonly affected .For this reason we call this front end overload or RF overload .

A strong enough front end overload field may produce spurious signals in the receiver which may cause interference . Quote

What does this mean and what is spurious signals interference ? Can other people radio get this interference ?

Because we are getting channels bleeding in on are taxi fleet of radios by other users using frequency very close to the one we use. When some one press the mike to talk some times channels bleed in for short time no more than 5 to 10 seconds and in 10 hour shift this may happen 2 or 3 times.It seems to happen more when some one try to talk to dispatch or dispatch try to talk to the fleet.It is a channels bleed in from the other frequency very close to the frequency we use.Even some times are channels bleed in two !! The dispatcher is talking on channel 1A and we can hear it on channel 1B .Note this channels bleed over is very short no more than 5 to 10 seconds and in 10 hour shift this may happen 2 or 3 times.

Is it are radios the problem ? a transmitter or receiver overload ?

I found some electronic equipment outside in a barn that has been sitting there for a long time. I know someone who plugged something in that was outside and didn’t let it dry out and it got fried. Does anyone know how long You should leave things like Cassette tape players, VCR’s, an alarm clock, and record players inside before plugging them in so they won’t fry the circuit board inside. It was Humid and raining before I brought them inside.

Will there be a problem if I plug a window AC unit into the same electrical circuit as electronic equipment such as computers and home AV gear? The closest outlet on another breaker is 20 feet away through a door and this room needs additional cooling in the summer. the unit is rated to only draw 5.3 Amps normally so it shouldn’t blow the fuse, but I don’t know if the compressor surge/voltage drop when it kicks on will harm the other electronics.

1. Two electronics students are discussing static electricity. Student A says that a basic property of static electricity is the fact that it can't be detected. Student B says that an electric current results when electrons move in a conductor. Which of the following statements is correct?

A. Only Student A is correct.
B. Only Student B is correct.

C. Both of the students are correct.

D. Neither of the two students is correct.

2. Two electronics technicians are looking at the technical manual for a piece of electronic equipment. The manual refers to a particular resistor as a "2.2 megohm resistor." Technician A says that this means that the resistance value of the resistor is 22,000 ohms. Technician B says that this means that the resistor can safely carry a current of 2,200,000 amperes. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.

C. Both Technician A Technician B are correct.

D. Neither of the two technicians is correct.

3. Two electronics technicians are discussing electronic components. Technician A says that electronic components are color-coded to indicate their electrical values. Technician B says that electronic components are color-coded to indicate their temperature ratings. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.

C. Both Technician A and Technician B are correct

D. Neither of the two technicians is correct.

4. Figure A-1 shows two pith balls suspended by threads from a support. In the figure,

A. the pith balls are uncharged.
B. pith ball 1 is positively charged, and pith ball 2 is negatively charged.

C. pith balls 1 and 2 have the same charge.

D. pith ball 1 is negatively charged, and pith ball 2 is positively charged.

5. What would happen if the two pith balls shown in Figure A-1 were held together for a few moments, then released?

A. The charge would leak off and the pith balls would hang straight down.
B. The pith balls would each receive a negative charge and they would move apart.

C. The charge would cause the pith balls to stick together.

D. The pith balls would each receive a positive charge and they would move apart.
FIGURE A-1—Use this illustration to answer Questions 4 and 5.

6. Two electronics technicians are looking at the piece of testing equipment shown in Figure A-2. Technician A says that this piece of equipment is called a digital multimeter. Technician B says that this piece of equipment is substituted for the power conversion circuits inside a piece of equipment that's being tested. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.

C. Both Technician A and Technician B are correct.

D. Neither of the two technicians is correct.
FIGURE A-2—Use this illustration to answer Question 6.

7. Two electronics technicians are discussing electrical quantities. Technician A says that resistance is an opposition to electrical power and voltage is electrical pressure. Technician B says that current is the rate of electrical flow in a circuit and voltage is the opposition to current flow. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.

C. Both Technician A and Technician B are correct.

D. Neither of the two technicians is correct.

8. Look at the resistor illustrated in Figure A-3. Based on your knowledge of the resistor color code, what are the resistance value and tolerance of this resistor?

A. 7.9 k 10%
B. 63 k 5%

C. 92 k 20%

D. 124 k 5%
FIGURE A-3—Use this illustration to answer Question 8.

9. Two electronics technicians are looking at the representations of a silver atom and a copper atom in Figure A-4. Technician A says that silver and copper are both good conductors because their atoms have single electrons in their outermost orbits. Technician B says that silver is a better conductor than copper because the silver atom's free electron is farther from its nucleus than the copper atom's free electron is from its nucleus. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.

C. Both Technician A and Technician B are correct.

D. Neither of the two technicians is correct.
FIGURE A-4—Use this illustration to answer Question 9.

10. Two electronics technicians are discussing conductors and insulators. Technician A says that conductors have more free electrons than insulators. Technician B says that
my answers are; 1b,2d,3a,4c,5a,6d,7d,8b,9b,10a,11b,12d,13d,14a,15a,16b,17d,18a,19b,20d. thanks for checking!!!

1. When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,

A. the resistance will increase.
B. the current will increase.

C. the resistance will decrease.

D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?

A. Telephone services
B. The Internet

C. Newspaper publishing

D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical

A. conductors.
B. batteries.

C. insulators.

D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called

A. a signal generator.
B. a power supply.

C. an oscilloscope.

D. a multimeter.

FIGURE A-1—Use this illustration to answer Question 5.

5. Look at the four schematic symbols shown in Figure A-1. Each of the symbols is labeled with a number. Which of the following statements about these symbols is correct?

A. Symbol 1 represents a diode, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a transistor.
B. Symbol 1 represents a diode, symbol 2 represents an LED, symbol 3 represents a transistor, and symbol 4 represents a resistor.

C. Symbol 1 represents a transistor, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a diode.

D. Symbol 1 represents a transistor, symbol 2 represents a diode, symbol 3 represents a resistor, and symbol 4 represents an LED.

6. Which of the following is a correct definition of the term rectification?

A. Rectification is the opposition to current flow in a circuit.
B. Rectification involves sensing an electrical quantity and converting it to a signal.

C. Rectification is the conversion of AC current to DC current.

D. Rectification refers to the connection of components into a circuit.

FIGURE A-2—Use this illustration to answer
Questions 7–10.

7. Look at the simple circuit illustrated in Figure A-2. What will happen when only switch S1 is closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

8. In the circuit shown in Figure A-2, what will happen when switches S1 and S3 are both closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

9. In the circuit shown in Figure A-2, what will happen when switches S2 and S3 are both closed?

A. The light bulb will light up.
B. Current will flow in the circuit.

C. The resistance of the circuit will increase.

D. Nothing will happen—the light bulb won't light up.

10. In the circuit shown in Figure A-2, which switches must be closed in order for the light bulb to light up?

A. Only switch S1 needs to be closed in order for the light bulb to light up.
B. Only switches S1 and S2 need to be closed in order for the light bulb to light up.

C. Only switches S1 and S3 need to be closed in order for the light bulb to light up.

D. Only switches S2 and S3 need to be closed in order for the light bulb to light up.

11. At a job interview, the most effective way to prove your proficiency to a prospective employer is to show that you have

A. membership in several professional organizations.
B. certification as an electronics technician.

C. experience with on-line research.

D. your own test equipment.

12. Which one of the following letters is used as an abbreviation when representing a unit of electric current?

A. E
B. R

C. C

D. A

FIGURE A-3—Use this illustration to answer Question 13.

13. Safety is a concern around electronic equipment of all types. When you see the sign and the symbol shown in Figure A-3, what particular safety hazard may exist?

A. High voltage
B. Laser light

C. Delicate equipment

D. Radioactivity

14. Which of the following statements about light-emitting diodes is correct?

A. Light-emitting diodes conduct current in either direction in circuits.
B. Light-emitting diodes are used as indicators in circuits.

C. Light-emitting diodes have very short life-spans in circuits.

D. Light-emitting diodes are used

Been working on this awhile now, could really use the help, thanks a bunch … your help is greatly appreciated.

1. Two electronics students are discussing static electricity. Student A says that a basic property of static electricity is the fact that it can’t be detected. Student B says that an electric current results when electrons move in a conductor. Which of the following statements is correct?

A. Only Student A is correct.
B. Only Student B is correct.
C. Both of the students are correct.
D. Neither of the two students is correct.

2. Two electronics technicians are looking at the technical manual for a piece of electronic equipment. The manual refers to a particular resistor as a “2.2 megohm resistor.” Technician A says that this means that the resistance value of the resistor is 22,000 ohms. Technician B says that this means that the resistor can safely carry a current of 2,200,000 amperes. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A Technician B are correct.
D. Neither of the two technicians is correct.

3. Two electronics technicians are discussing electronic components. Technician A says that electronic components are color-coded to indicate their electrical values. Technician B says that electronic components are color-coded to indicate their temperature ratings. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct
D. Neither of the two technicians is correct.

4. Figure A-1 shows two pith balls suspended by threads from a support. In the figure,

A. the pith balls are uncharged.
B. pith ball 1 is positively charged, and pith ball 2 is negatively charged.
C. pith balls 1 and 2 have the same charge.
D. pith ball 1 is negatively charged, and pith ball 2 is positively charged.

5. What would happen if the two pith balls shown in Figure A-1 were held together for a few moments, then released?

A. The charge would leak off and the pith balls would hang straight down.
B. The pith balls would each receive a negative charge and they would move apart.
C. The charge would cause the pith balls to stick together.
D. The pith balls would each receive a positive charge and they would move apart.
FIGURE A-1—Use this illustration to answer Questions 4 and 5.

6. Two electronics technicians are looking at the piece of testing equipment shown in Figure A-2. Technician A says that this piece of equipment is called a digital multimeter. Technician B says that this piece of equipment is substituted for the power conversion circuits inside a piece of equipment that’s being tested. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither of the two technicians is correct.
FIGURE A-2—Use this illustration to answer Question 6.

7. Two electronics technicians are discussing electrical quantities. Technician A says that resistance is an opposition to electrical power and voltage is electrical pressure. Technician B says that current is the rate of electrical flow in a circuit and voltage is the opposition to current flow. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither of the two technicians is correct.

8. Look at the resistor illustrated in Figure A-3. Based on your knowledge of the resistor color code, what are the resistance value and tolerance of this resistor?

A. 7.9 kW 10%
B. 63 kW 5%
C. 92 kW 20%
D. 124 kW 5%
FIGURE A-3—Use this illustration to answer Question 8.

9. Two electronics technicians are looking at the representations of a silver atom and a copper atom in Figure A-4. Technician A says that silver and copper are both good conductors because their atoms have single electrons in their outermost orbits. Technician B says that silver is a better conductor than copper because the silver atom’s free electron is farther from its nucleus than the copper atom’s free electron is from its nucleus. Which of the following statements is correct?

A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither of the two technicians is correct.
FIGURE A-4—Use this illustration to answer Question 9.

10. Two electronics technicians are discussing conductors and insulators. Technician A says that conductors have more free electrons than insulators. Technici

On to college, being a radiologic technologist doesn’t require a huge amount of college. Knowing computers is an additional thing I found that was important in this line of employment, this is because working the x-ray machine includes working with circuit boards, processors, electronic equipment, computer hardware and computer software. This topic is something I could defiantly learn a lot about. Two years, or an associates degree at a technical school is needed. During these two years my class load would be heavy, some students prefer to space the courses out and go to college for 3 years (Radiologic Technologists and Technicians). Things studied during college are radiation protection, pathology, patient care procedures and medical ethics among other things. After college, you can become certified or licensed by the American Registry of Radiologic Technologists, certification will help you when applying for a job. To get this certification I would have to pass an exam on everything I learned in college (How To Be an X-Ray…). Another helpful piece of advice I’ve found was that to get more experience you should train or take an intern ship at a hospital , or enlist in an accredited radiography program (How To Be an X-Ray…).
I think when looking for a job or researching a career you should look for one that you already have the personality traits for considering it is hard to change your personality. One trait I think is common sense is, caring for people and being a people person. Through out the day in this field you are helping people, trying to make them less in pain, help them know what is wrong, or talking to various doctors and medical personal. So being someone who can get along with a lot of people would greatly help in this occupation. This is something I feel I would be good at because I enjoy being around people and am a people person. Also I have found out that time management is a good skill or trait to have as an x-ray technologist (Radiologic Technologist). You need to keep in mind at all times the other injured patients waiting to be taken care of. Next I think another skill that goes hand-in-hand with time management is coordination. Career Zone explains this skill as “adjusting actions in relation to others’ actions”. Two more personality traits that I think easily relate to one another are being able to think critically and being able to instruct others easily. The first, critical thinking or logic, is needed when comparing and contrasting individual solutions and outcomes. Critical thinking is needed to instruct others, every situation will be different working in this field (Radiologic Technologist). For example, one day you may be instructing a little boy with a broken arm how to waterproof his cast before showering, where as the next day you could be informing an elderly lady about her broken ankle. Overall I think I have these skills but if I do plan on being a radiologic technologist I should work on my instruction skills.
So far this seems like a rewarding career but when exploring this job I have found two other jobs that are rather thought-provoking, for one, a radiation therapist. People in this career make about the same salary as an x-ray technologist, have more schooling but can provide radiation therapy. These professionals can still take x-rays though (Radiation Therapists). This job sounds nice but an radiologic technologist still sounds better. The next job I came across that I was curious about was a nuclear medicine technologist. People in this career most times have to get a bachelors degree and have a slightly higher salary. Nuclear medicine technology is not about bones and the human body, which is what I’m interested in. This career involves more knowledge, diagnostics, and radiation therapy of the blood, cells, fat and muscles (Nuclear Medicine Technologist). Both of these careers would be more striking if I wanted to broaden my radiologic technologist career.
Even after my research of a radiologic technologist, I have still do not have a great idea of what I want to be when I get out of high school. Radiologic technology has proven to me it is a very interesting field with a lot of room for growth but I’m still not totally convinced that this is the job for me.
its an i-search paper, i am supposed to use 'I".

1. When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,

A. the resistance will increase.
B. the current will increase.
C. the resistance will decrease.
D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?

A. Telephone services
B. The Internet
C. Newspaper publishing
D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical

A. conductors.
B. batteries.
C. insulators.
D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called

A. a signal generator.
B. a power supply.
C. an oscilloscope.
D. a multimeter.

When electric current is flowing in a circuit, if the voltage applied to the circuit is increased,
A. the resistance will increase.
B. the current will increase.
C. the resistance will decrease.
D. the current will decrease.

2. Which of the following information sources will not be directly affected by the Telecommunications Act of 1996?
A. Telephone services
B. The Internet
C. Newspaper publishing
D. Cable television

3. Porcelain, paper, glass, and rubber are all examples of electrical
A. conductors.
B. batteries.
C. insulators.
D. grounds.

4. A testing instrument that an electronics technician will connect to selected points inside a piece of electronic equipment and measure electrical values such as ohms, volts, and amperes is called
A. a signal generator.
B. a power supply.
C. an oscilloscope.
D. a multimeter.

FIGURE A-1—Use this illustration to answer Question 5.

5. Look at the four schematic symbols shown in Figure A-1. Each of the symbols is labeled with a number. Which of the following statements about these symbols is correct?
A. Symbol 1 represents a diode, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a transistor.
B. Symbol 1 represents a diode, symbol 2 represents an LED, symbol 3 represents a transistor, and symbol 4 represents a resistor.
C. Symbol 1 represents a transistor, symbol 2 represents a resistor, symbol 3 represents an LED, and symbol 4 represents a diode.
D. Symbol 1 represents a transistor, symbol 2 represents a diode, symbol 3 represents a resistor, and symbol 4 represents an LED.

6. Which of the following is a correct definition of the term rectification?
A. Rectification is the opposition to current flow in a circuit.
B. Rectification involves sensing an electrical quantity and converting it to a signal.
C. Rectification is the conversion of AC current to DC current.
D. Rectification refers to the connection of components into a circuit.

FIGURE A-2—Use this illustration to answer
Questions 7–10.

7. Look at the simple circuit illustrated in Figure A-2. What will happen when only switch S1 is closed?
A. The light bulb will light up.
B. Current will flow in the circuit.
C. The resistance of the circuit will increase.
D. Nothing will happen—the light bulb won’t light up.

8. In the circuit shown in Figure A-2, what will happen when switches S1 and S3 are both closed?
A. The light bulb will light up.
B. Current will flow in the circuit.
C. The resistance of the circuit will increase.
D. Nothing will happen—the light bulb won’t light up.

9. In the circuit shown in Figure A-2, what will happen when switches S2 and S3 are both closed?
A. The light bulb will light up.
B. Current will flow in the circuit.
C. The resistance of the circuit will increase.
D. Nothing will happen—the light bulb won’t light up.

10. In the circuit shown in Figure A-2, which switches must be closed in order for the light bulb to light up?
A. Only switch S1 needs to be closed in order for the light bulb to light up.
B. Only switches S1 and S2 need to be closed in order for the light bulb to light up.
C. Only switches S1 and S3 need to be closed in order for the light bulb to light up.
D. Only switches S2 and S3 need to be closed in order for the light bulb to light up.

11. At a job interview, the most effective way to prove your proficiency to a prospective employer is to show that you have
A. membership in several professional organizations.
B. certification as an electronics technician.
C. experience with on-line research.
D. your own test equipment.

12. Which one of the following letters is used as an abbreviation when representing a unit of electric current?
A. E
B. R
C. C
D. A

FIGURE A-3—Use this illustration to answer Question 13.

13. Safety is a concern around electronic equipment of all types. When you see the sign and the symbol shown in Figure A-3, what particular safety hazard may exist?
A. High voltage
B. Laser light
C. Delicate equipment
D. Radioactivity

14. Which of the following statements about light-emitting diodes is correct?
A. Light-emitting diodes conduct current in either direction in circuits.
B. Light-emitting diodes are used as indicators in circuits.
C. Light-emitting diodes have very short life-spans in circuits.
D. Light-emitting diodes are used as rectifiers in circuits.

15. On a printed circuit board, electronic components will be mounted
A. from the substrate side of the board.
B. from the side of the board that contains the conducting paths.