A metallic wire obeys Ohm’s law

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

Problem

A metallic wire obeys Ohm’s law. On its

V

–

I

graph, two points on the straight line are

(2\,\text{V},\;0.10\,\text{A})

and

(8\,\text{V},\;0.40\,\text{A})

. Calculate the resistance of the wire. (a)

5\,\Omega

(b)

20\,\Omega

(c)

12\,\Omega

(d)

40\,\Omega

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