If the Lamp A(250v) with 50watt works on 125v calculate the heat produced in 10min
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watt is also expressed as joules/second.
if you convert time in minutes into time in seconds and multiply it with watt, you'll get the quantity of heat produced in joules.
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2 minutes = 60×2 seconds = 120 seconds
100 watt = 100 joules/sec
heat produced by heater in two minutes = 100 × 120 = 12000 Joules or 12 KJ.
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