Question 1

What can be found by measuring current and voltage?

Accepted Answer

Resistance

Answer

Resistivity

Answer

The direction of North

Answer

Magnetic field strength

Question 2

What is the unit of resistance?

Accepted Answer

Ohm

Answer

Ampere

Answer

Coulomb

Answer

Volt

Question 3

How is the current of a resistor related to the potential difference across it?

Accepted Answer

Directly proportional

Answer

Equal

Answer

One-fifth of the potential difference

Answer

Inversely proportional

Question 4

Which equation correctly relates voltage, resistance and current?

Accepted Answer

V = I x R

Answer

R = I ⁄ V

Answer

I = R ⁄ V

Answer

V= I ⁄ R

Question 5

The current through a component depends on what?

Accepted Answer

Its resistance

Answer

The number of components in series in the circuit

Answer

The size of the component

Answer

The size of the component

Question 6

If a 100Ohm resistor is replaced with a 200Ohm resistor, whilst the potential difference is kept constant, what happens to the current?

Accepted Answer

Decreases

Answer

Stays the same

Answer

There is not enough information

Answer

Increases

Question 7

If three 1.5V cells are connected in series, what is the total potential difference provided by the cells?

Accepted Answer

4.5V

Answer

5.5V

Answer

3V

Answer

1.5V

Question 8

If two 5Ohm resistors are connected in series, what is the total resistance of the circuit?

Accepted Answer

10Ohm

Answer

2.5Ohm

Answer

5Ohm

Answer

7.5Ohm

Question 9

If two resistors are connected in parallel in a circuit, which has a total p.d of 5V, what is p.d across each resistor?

Accepted Answer

5V

Answer

1.25V

Answer

2.5V

Answer

10V

Question 10

An LED emits light when the current flows through it in which direction?

Accepted Answer

Forwards

Answer

Up and down

Answer

No current flow

Answer

Backwards

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