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26 December, 10:41

A lightning flash may transfer up to 14 C of charge through a potential difference of 107 V

How much energy does this involve?

For how long in minutes does this energy light a 100 W bulb?

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Answers (1)
  1. 26 December, 10:48
    0
    Energy involved = 1498 J

    Time taken by this energy to light a 100 W bulb = 0·25 min

    Explanation:

    Charge that is transferred = 14 C

    Potential difference = 107 V

    Formula for power in terms of potential difference (V) and current (I) = V * I

    And power is also equal to (work done) : (time taken)

    Current (I) = (charge transferred) : (time taken)

    Formula for energy = V * Qwhere V is the potential differenceQ is the charge transferred

    ∴ Energy involved = 107 * 14 = 1498 J

    Given power of the bulb = 100 W

    Energy : (time taken) = 100

    1498 : (time taken) = 100

    ∴ Time taken = 14·98 s = 14·98 : 60 min = 0·25 min
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