Q6 of 44 Page 85

An electric heater consumes 4.4 kW power when connected with a 220 V lines voltage then,

i. Calculate the current passing through the heater.


ii. Calculate resistance of a heater.


iii. Calculate the energy consumed in 2 hours.

i. Current passing

Formula used


Power formula è P = VI


P = power


V = Voltage


I = Current



I = 20 A


ii. Resistance of heater


Formula used


Power Formula



P = power


V = voltage


R = resistance



R = 11Ω


iii. Energy consumed in 2 hrs


The power is 4.4 kW; It means that 4400 joules is consumed in 1 sec


In 2 hrs è 3600 x 2 secs


The energy consumed will be


= 4400 x 3600 x 2


= 3.168 x 107 joules


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