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a) Name a device which helps to maintain a potential difference across a conductor(say, a bulb).
b) If a potential difference of 10V causes a current of 2 A to flow for 1 minute, how much energy is transferred?
a) A cell or a battery helps to maintain a potential difference across a conductor.
b) Given: The potential difference = 10v.
The current produced in 1 min = 2A.
To find: We have to find the energy transferred.
Solution:
We know that Q = I X T.
=> Q = 2 x 60 = 120 C.
Now, work done is the energy transferred. Therefore,
Work done = Potential difference x charge moved
Work done = 120 x 10 = 1200J.
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