Resistance and Power MCQs

Question 1

How much energy is stored if 6.24 x 1018 electrons are stored in 4 volts?

Accepted Answer

4 joules

Answer

1.56 x 1018 electrons

Answer

1.56 coulombs

Answer

2.496 x 1019 electrons

Question 2

With Ohm's law:

Accepted Answer

current is inversely proportional to resistance

Answer

resistance is directly proportional to voltage

Answer

voltage is indirectly proportional to power

Answer

current is directly proportional to resistance

Question 3

Power is defined as:

Accepted Answer

the rate at which energy is used

Answer

watts

Answer

energy

Answer

the rate at which energy is generated

Question 4

What is the most commonly used conductor in electronics?

Accepted Answer

copper

Answer

aluminum

Answer

gold

Answer

silver

Question 5

With Ohm's law, no change in resistance means that current and voltage will be:

Accepted Answer

directly proportional

Answer

unable to produce energy

Answer

the same

Answer

inversely proportional

Question 6

A potentiometer has how many leads?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 7

What is the ratio of 13 to 47 expressed in percent?

Accepted Answer

27.7%

Answer

2.76%

Answer

3.60%

Answer

36.1%

Question 8

What happens to current and resistance if the voltage doubles?

Accepted Answer

Current doubles and resistance remains the same.

Answer

Current doubles and resistance doubles.

Answer

Current doubles and resistance is halved.

Answer

Current remains the same and resistance doubles.

Question 9

One problem with mechanically variable resistors is noticeable in audio circuits as:

Accepted Answer

scratchy noise

Answer

lack of bass response

Answer

variable volume

Answer

too much treble response