The voltage of a cloud is 4 × 106 volts with respect to ground. In a lightening strike lasting 100 ms-1, a charge of 4 coulombs is delivered to the ground. The power of the lightening strike is:
Answer & explanation
Correct answer: option 1
Work done = charge × potential difference
W = 4 × (4 × 106 - 0) = 16 × 106 J
Power of the lightening strike,
P = $\frac{W}{t} = \frac{16 \times 10^6}{100 \times 10^{-3}}$ = 160MW