Electricity

3 marks · Easy

A 12 Ω resistor is connected to a 6 V battery.

(a)

Calculate the current through the resistor.

[2 marks]

(b)

State the equation linking current, voltage and resistance.

[1 mark]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

(a) 0.5 A

(b) V = I × R

Common mistakes: Reversing V and I in V=IR

Show mark scheme and worked solution

Marking points

M1 (a) · 1 mark · Uses I = V / R or V = I × R correctly rearranged.

A1 (a) · 1 mark · Calculates correct current: 0.5 A. (follow-through)

B1 (b) · 1 mark · States correct formula: V = I × R (or I = V / R).

Worked solution

a) I = V / R = 6 V / 12 Ω = 0.5 A

b) The equation is V = I × R.