The current in a circuit with an external resistance of is

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

The current in a circuit with an external resistance of

3.75\,\Omega

is

0.5\,\mathrm{A}

. When a resistance of

1\,\Omega

is introduced into the circuit, the current becomes

0.4\,\mathrm{A}

. The emf of the power source is (1)

1\,\mathrm{V}

(2)

2\,\mathrm{V}

(3)

3\,\mathrm{V}

(4)

4\,\mathrm{V}

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