A Torch Bulb Is Rated at 3V and 600mA. Calculate It’s Power and Resistance.

Given: Voltage = 3V Current = 600 mA = 600×10-3

Therefore, Power = VI

P = 3×60×10-3

P = 1800×10-3

P = 1.8 W.

Resistance = V2/P

Resistance = 9/1.8 = 5

Hence, resistance, R = 5Ω.

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