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

The lighting in a house has 20 lamps each rated 60w, 240v.Determine whether a fuse rated 4A can be used in the circuit when all the lamps are put on.

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Answer Text:
Total power = 20 x 60w = 1200w.
#P = IV#
#I =P/V = 1200/240# = 5A. 4A fuse is not suitable since the current passing through is higher than 4A.