An electric iron of resistance 10 Ω draws 2A from the mains for 10 min. Find
the heat developed and power consumed in the coil of iron.
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Explanation:
Electric Current = 2 A
Resistance = 10 Ω
Time = 10 min = 10×60 sec = 600 s
Heat developed = I²R t = 2² × 10 × 600 J = 24000 J
= 24 KJ
Power = Heat/time = 24000 J/600s = 40 Watt
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