Electric Circuits Random Retrieval

This quiz contains all the questions in the Electric Circuits section. The website will pick 10 questions at random.

1 / 10

The unit of resistivity is the ohm-metre. A correct alternative unit is:

AmV^-1

VmA^-1

VAm^-1

Am^-1V^-1

2 / 10

The unit of power is the watt. A correct alternative unit is:

VCs^-1

Ω²V^-2

V²Ω

V²Ω^-2

3 / 10

The unit of potential difference is the volt. A correct alternative unit is:

CΩ^-1s^-1

ΩC^-1s^-1

CΩs

CΩs^-1

4 / 10

The unit of resistance is the ohm. A correct alternative unit is:

WA²

WA^-1

WA^-2

WA

5 / 10

Select a use for this circuit when the temperature fluctuates. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

6 / 10

Plotting a graph of V against I, what is the gradient equal to?

r

-r

Ɛ

-Ɛ

7 / 10

Which of these expressions is not a correct expression for calculating the electrical power of a circuit?

Expression A

Expression B

Expression C

Expression D

8 / 10

A 50 Ω resistor in an electric circuit has a potential difference across it of 20 V. Calculate the current through the resistor.

0.4 A

1 A

2.5 A

1 kA

9 / 10

Potential difference is...

The current per second of a closed circuit.

The work done per unit charge moved.

The amount of charge passing a point in a closed circuit per second.

The difference in unit charge either side of a battery.

10 / 10

A smart phone has a charge flowing through it of 2 mC every 5 s. Calculate the current.

0.4 A

0.01 A

4x10^-3 A

1x10^-3 A

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