I am trying to install a additional parts to my car. when i remove the bare PCB with lcd from the head unit. i accidentally grounded the circuit board to the Metal plate, it create a little spark. now the LCD doesn’t work.

my question are
1. is the circuit board fried?
2. could it be just a blown fuse?
3. after ground the board, could it be just burn resistor?

Im going to changing all the lights in my car to LEDs. I will be using 3mm and 5mm leds, and will have to add a 470ohm resistor to each led.

Now my question is when I solder the led, I solder the led on, then I solder the the resistor to the positive side of the led after the solder joint.

So pretty much is would be LED, Resistor, solder joint, circuit board.

Did that make any sense?

Thanks all.

(P1) Use dc circuit theorems to solve one circuit problem using Thevenin’s theorem, one using Norton’s theorem and one using the Maximum Power Transfer theorem.

(a) In the following circuit use Thevenin’s theorem to determine the current in the 1.6 ohm resistor

(b) Apply Norton’s theorem to the circuit below to find the current in the 20 ohm resistor

(c) Using the Maximum Power Transfer theorem determine the value of R in the circuit below in order that maximum power is transferred to it from the rest of the circuit

if you can only answer one that is great any help is really appreciated.

LINKS ARE TO THE QUESTIONS PHOTO!

automobile from a blower resistor for a vent fan in a car?

Any simple/precise answer to these questions will be appreciated. Thanks!
1. What is the basic equation for power (in terms of amps + ohms)?
2. What is the purpose of a resistor?
3. Which is a more efficient electronic circuit: parallel or series?
4. Why do scientists refer to current (I) as if it flows from positive to negative when, in actuality, electrons flow from negative to positive?
5. How are static friction coefficients calculated?
6. What is diffraction?
7. How are electric fields/magnetic fields created?
8. Do each of these fields induce a corresponding force?
9. What is the Law of Induction?
10. How does one change the magnetic field?
11. What is magnetic flux?
12. What is electric flux (if that even exists)?
13. How does flux affect Induction?
14. Is there a way kinetic energy (like a treadmill or stationary bike) could power a light bulb with electromagnetic induction?

i was trying to circuit bend my omnichord, i touched the board in one place and lost the strumming sound and the chord sounds..the drums still work so i’m sure it’s just a cap or a resistor that’s fried…will a volt meter do me any good in finding the burnt component?

I have a simple serial circuit consisted of a battery, diode, resistor, led and ground (in this order). What is a ground? And what is the right way to connect the components? + to + + to -?

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

i'm solving electronic homework ,and i got the values R1=66.67
R2=12.4k
(and Rs=10 ,RL=1k are given),there is part in the question which want me to chose the closet values for the resistor before i design the circuit in pspice program.
can u tell me how i can chose from the given appendix below

Preferred resistance values (approximately 10% increase)

I1.01.52.23.34.76.8
II1.11.62.43.65.17.5
III1.21.82.73.95.68.2
IV1.32.03.04.36.29.1

I to IV for (+-)5% tolerance resistors
I and III for (+-)10% tolerance resistors
I for (+-)20% tolerance resistors

Values multiplied by 1, 10, 100, 1k, 10k, 100k, 1M, 10M
Multiplier 10 to 100k can cover all the preferred values
E.g. 11, 110, 1.1k, 11k, 110k

Resistor types: Carbon film, metal film, wirewound
i think this will be clear

I(1.0)(1.5)(2.2)(3.3)(4.7)6.8)
II(1.1)(1.6)(2.4)(3.6)(5.1)(7.5)
III(1.2)(1.8)(2.7(3.9)(5.6)(8.2)
IV(1.3)(2.0)(3.0)(4.3)(6.2)(9.1)