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14/07/2021 3:05 pm
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(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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14/07/2021 3:07 pm
(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 = I x t
Q = 2 × 60
Q = 120 C
Work done = p.d. x charge moved
Work done = 120 x 10J
Work done = 1200J