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3 years ago

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

Physics

1 answer:

dmitriy555 [2]3 years ago

5 0

Answer:

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

<h3>And power is also equal to (work done) ÷ (time taken)</h3>

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

<h3>Formula for energy = V × Q</h3><h3>where V is the potential difference</h3><h3>Q is the charge transferred</h3>

∴ 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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