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The voltage of clouds is 4 × 10 6 V with respect to ground. In a lightning strike lasting 100 ms , a charge of 4 C is delivered to the ground. The average power of lightning strike is (assume complete discharges )

Options

  1. A160 MW
  2. B80 MW
  3. C20 MW
  4. D500 KW

Correct answer

B. 80 MW

Step-by-step solution

Energy stored between cloud and earth, assuming the capacitor model is W = qV 2 4 × 10 6 × 4 2 = 8 × 10 6 J The power of lightning strike is P = W t = 8 × 10 6 0.1 = 80 × 10 6 W = 80 M W

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