A flash of lightning carries $10\ C$ of charge which flows for $0.01\ s$. What is the current? If the voltage is $10MV$, what is the energy?
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$Q = 10C$
$t = 0.01s$
$\text{I}=\frac{\text{Q}}{\text{t}}=\frac{10}{0.01}=1000\text{A}$
$\text{P}.\text{d}=\frac{\text{W}}{\text{Q}}$
$W = P.d \times Q$
$= 10 \times 10^6 \times 10 = 100 \times 10^6 = 100MJ$
Energy - Work done $= 100MJ$
$t = 0.01s$
$\text{I}=\frac{\text{Q}}{\text{t}}=\frac{10}{0.01}=1000\text{A}$
$\text{P}.\text{d}=\frac{\text{W}}{\text{Q}}$
$W = P.d \times Q$
$= 10 \times 10^6 \times 10 = 100 \times 10^6 = 100MJ$
Energy - Work done $= 100MJ$
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