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.

C. from the foil side of the board.

D. from the side of the board that's covered with copper sheeting.

16. Which of the following statements about the measurement of electrical quantities is correct?

A. Resistance is measured in units called ohms.
B. Voltage is measured in units called amperes.

C. Electrical pressure is measured in units called watts.

D. Current is measured in units called volts.

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

Sorry I didn’t know how to word the question well. Ok, I’m very interested in being able to make my own circuits but I have a very limited knowledge of electronic components. I just want to make some basic circuits right now with some LED’s. All I need are the LED’s, some switches, and some copper wiring preferably all in one store. So where should I go to get those things? Also, how do you keep all the pieces in a circuit stuck together? I don’t just want to use tape to keep everything in place.

Yesterday right after midnight (new years) I went to put some stuff in my trunk and I accidentally threw some heavy power tools on top of my amplifier and capacitor, as soon as i did that my radio, amp and instrument panel all went haywire. this morning I removed ALL aftermarket wiring and electronic components (radio, amp, speaker wires, power wires, car alarm, etc) and was not able to find a reason why my instrument panel was still going going crazy (fuel and heat gauges go up and down and the speedometer is not working) and the lights in and around the car dim when i shake the car like if there were a wire or terminal loose, it does this with the engine running or with the battery by itself. If the car sits still everything looks and works fine until i move it.

I have been hoping this is just a short circuit and that with time and a voltage meter i will be able to find the short somewhere but i have been searching for hours… Is this really a short circuit or did something other than wires get fried and im wasting my time looking for something that is not there?

I need to design a small PCB to convert 230V AC to 24V DC, what are the main electronic components to be used? if possible provide me the circuit diagram my email is devanand_b_k@yahoo.co.in

I want to make my own bluetooth headphone for N73. So i need the circuit diagram with all electronic components like registers, capacitors should be shown with their value.

One circuit has some electronic components: microcontroller,gyroscope and bluetooth module.Gyroscope and bluetooth module can support maximum voltage of 3V but microcontroller use voltage between 6.5-9 V.How can we make this circuit possible?
What does voltage regulator do?

Yesterday right after midnight (new years) I went to put some stuff in my trunk and I accidentally threw some heavy power tools on top of my amplifier and capacitor, as soon as i did that my radio, amp and instrument panel all went haywire. this morning I removed ALL aftermarket wiring and electronic components (radio, amp, speaker wires, power wires, car alarm, etc) and was not able to find a reason why my instrument panel was still going going crazy (fuel and heat gauges go up and down and the speedometer is not working) and the lights in and around the car dim when i shake the car like if there were a wire or terminal loose, it does this with the engine running or with the battery by itself. If the car sits still everything looks and works fine until i move it.

I have been hoping this is just a short circuit and that with time and a voltage meter i will be able to find the short somewhere but i have been searching for hours… Is this really a short circuit or did something other than wires get fried and im wasting my time looking for something that is not there?
Update- It is a very well maintained 99 dodge neon with 70k miles. Everything is working and running fine but when I hit a bump or brake, the interior lights get dim or blink. It also does this with the engine off when I manually shake the car myself with my hands, so it is not a problem with the alternator or charging system, it is most likely bad wiring. What is the easiest way to find this bad wire or connectors, is tracing one of the wires back to the battery the only way? I am having a very hard time, any expert advice will help much.

There was a fire at my shop, smoke residue (carbon) has settled over coin-operated arcade games circuit boards. How can I safely remove this residue? Is there a chance that this residue could cause damage to the electronic components?

My nephew has one of those electronics kits consisting of some electronic components and a project book. The book suggests circuits to create using the kit and makes some obvious observation such as "When you closed the switch, the current flowed, lighting the lamp."

One project consists of a battery, a switch, a lamp and a motor which drives an axle on the end of which can be placed a fan. The project instructions call for the circuit to be closed with the fan in place and with the motor without the fan. In the latter case, the lamp is dimmer than in the former. The book provides no explanation, so my nephew turned to me. I haven't got a clue.
I apologize for the confusingly phrased question. By "fan" I meant the fan blade assembly. The motor stayed connected in series with the lamp. The circuit is a DC circuit as in all (most?) such electronic kits.

The motor and fan were connected in series in this instance primarily as a demonstration of the effect described.

Thank you all for your explanations. The current drop explanation satisfied my nephew. I'm going to have to digest the EMF back force concept before I try explaining that one to him.