Question

FOR A HEATER 4.4 kW ; 220V CALCULATE THE

1) CURRENT DRAWN BY HEATER

2) RESISTANCE OF HEATER ELEMENT

3)ENER GY CONSUMED BY THE HEATER IN 4 HOURS

4) COST OF RUNNING THE HEATER IF 1KwH COSTS RS. 6.50

Answer 1

Given: P=4.4kw
P=4.4 into 10*3w
V=220v
1) we have,
P=VI
I=P/V
I=4.4into10*3/220
I =20A

2)by ohms law,
V=IR
R=V/I
R=220/20
R=11ohm

3)E=PT
E =4.4*4
E=17.6KWH

4)cost of one kwh =Rs 6.50
Cost of 17.6kwh=17.6*6.50
Cost of 17.6kwh=Rs 114.4


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