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
