$(a)$ Define potential difference between two points in a conductor.

$(b)$ Name the instrument used to measure the potential difference in a circuit. How is it connected ?

$(c)$ A current of $2\, A$ passes through a circuit for $1$ minute. If potential difference between the terminals of the circuit is $3 \,V,$ what is the work done in transferring the charges ?

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$(a)$ Electric potential difference between two points in an electric circuit carrying current is the work done to move a unit charge from one point to the other.

$(b)$ Voltmeter. It is connected in parallel.

$(c)$ $I=2 A, t=1 \text { minute }=60 s, V=3 V$

$Q = I t=2 \times 60=120 C$

Therefore, $W=V Q=3 \times 120=360 J$

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