(a) Name a device which helps to maintain potential difference across a conductor (say, a bulb).
(a) Name a device which helps to maintain potential difference across a conductor (say, a bulb).
(b)If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred ?
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Solution :
(a) Cell or battery helps to maintain potential difference across a conductor.
(b) Given:
p.d. = 10 V, I = 2amp, t = 1 min = 60s.
We know that:
I=Q/t.
Thus, Q=Ixt.
Q=2×60.
Q=120 C.
Work done = p.d. x charge moved
Work done = 120x10J
Work done = 1200J.
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