ELECTRICAL RESISTANCE

3 marks · Easy

The diagram shows a circuit containing a 9 V battery and two resistors, each of 3 Ω, connected in series.

Series circuit: battery (9 V) and two resistors (each 3 Ω)

(a)

State the total resistance in the circuit.

[1 mark]

(b)

Calculate the current flowing through the circuit.

[2 marks]

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) 6 Ω

(b) 1.5 A

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · Adds resistances correctly for series: 3 Ω + 3 Ω = 6 Ω.

M1 (b) · 1 mark · Uses I = V / R with correct/own total resistance. (follow-through)

A1 (b) · 1 mark · Correct current: 1.5 A (accept calculator rounding). (follow-through)

Worked solution

a) Total resistance = 3 Ω + 3 Ω = 6 Ω