Three wires P, Q and R are connected one at a time to a battery

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

Problem

Three wires P, Q and R are connected one at a time to a

12\,\text{V}

battery. The currents recorded are: P

=3\,\text{A}

, Q

=1.5\,\text{A}

, and R

=4\,\text{A}

. Which wire has the greatest resistance? (a) P (b) Q (c) R (d) All three have the same resistance