ELECTRICAL RESISTANCE

3 marks · Normal

A lamp in a circuit has a resistance of 15 Ω. The potential difference across the lamp is 6.0 V.

Calculate the current passing through the lamp. Show your working and give the unit.

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

0.40 \; \mathrm{A} A (±0.01)

Common mistakes: dividing current by resistance; missing unit

Show mark scheme and worked solution

Marking points

M1 · 1 mark · Uses correct equation: I = V / R.

M2 · 1 mark · Substitutes correct numbers. (follow-through)

A1 · 1 mark · Correct answer: 0.4 A with unit.

Worked solution

I = V / R