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 Form 3 Physics: Heating Effect of an Electric Current Questions and Answers

An electric bulb with a filament of resistance 480 ohms is connected to a 240v mains supply. Determine the energy dissipated in 2 minutes.

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Answer Text:
#E = VIt = v^2/Rt = 240^2/480 times 2 times 60#
= 14400 Joules