Question

the maximum current that can allow to pass the 100 Watt lamp when potential is 250 volt is?​

Answer 1

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A 200 W, 100v lamp is to be operated on a 250v supply. ... now the circuit will contain 250 V power supply in series with above lamp and ... Max Power, the lamp can consume: 200W.

Answer 2

Answer:

The answer is indeed 75 ohms

Explanation:

Power (P) = Voltage (V)x Current(I)

substituting for P and V,

200 = 100 x I

I = 2 amps

The resistance of the lamp = V/I = 100/2 = 50 ohms

now the circuit will contain 250 V power supply in series with above lamp and another resistor R and lamp requires 2 amps of current to flow in the circuit. So, we just need to find total resistance for that,

R + 50(resistance of lamp) = V/I = 250/2 = 125 ohms

R + 50 = 125

R = 75 ohms