Question

A torch bulb is rated at 3V,600 mA. Calculate its (a) power (b) resostance (c) energy if operated for 3 hours.

Answer 1

Power, P = VI = 1800 mW = 1.8 W

resistance, R = V/I = 5 ohm

energy, H = Pt = 1.8 x (3 x 3600) = 14040 J

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