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

A heating coil is rated 100w, 240v.What will be the power dissipated by the coil if it is connected to a 220v supply.

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Answer Text:
#P= v^2/R #
#100 = 240^2/R#
R = 576 ohms.
#P =220^2/576 = 84.03w.#