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15/07/2021 1:42 pm
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A flash of lightning carries 10 C of charge which flows for 0.01 s. What is the current? If the voltage is 10 MV, what is the energy?
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15/07/2021 1:46 pm
Q = 10 C, t = 0.01 s
I = \(\frac{Q}{t}\)
= \(\frac{10}{0.01}\) = 1000 A
P.d = \(\frac{W}{Q}\)
W = P.d x Q
= 10 x 106 x 10 = 100 x 106 = 100 MJ
Energy = work done = 100 MJ