[ It is marked as 40W 230V on an incandescent lamp. If it is given 115V to this lamp, its power
will be ...... ]
40W
20W
10W
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Power of bulb will be 10W if 40W 230V is given 115V
Explanation:
Power of the bulb = V²/R
Power = 40W
Voltage = 230V
40 = 230²/R
=> R = 230²/40
R - Resistance of the bulb
now when voltage is 115 V
P = 115²/R
P = 115²/(230²/40)
=> P = 40 ( 115/230)²
=> P = 40 (1/2)²
=> P = 40/4
=> P = 10 W
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