Question

An electric iron of 1000 W is used for 2 h per day. Calculate the units' of energy
consumed in one month by the bulb both in kWh and Joules.​

Answer 1

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The total number of hours=2*30=60

Total energy consumption=60*1,1= 66 kWh

Energy cost = 66*5= Rs 330

It is to be noted that the iron has a thermostat, which trips when the set temperature is reached. The thermostat also resets when the temperature falls. This results in a duty cycle with an “on” period followed by an “off” period. This would result in a substantially lower energy consumption.