A 400 W heater is connected to 220v source of power calculate
i. the ele. Current passing throught the heater
ii. the resistance of the heater
iii. the elec. Energy consumed in 2hrs use of heater.
i. the ele. Current passing throught the heater
ii. the resistance of the heater
iii. the elec. Energy consumed in 2hrs use of heater.
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Answer:
Given
P=4kW,V=220V
(a) I=?
Power=VI=250×I
4000=250×I
I=16amp
(b) R=?
P=I2R
P=162×R
R=4000/162
R=15.25ohm
(c) Energy consumed in two hour =P×t
=4×2
=8kW−hr
(d) If 1kWh=Rs.4.6
total cost =8×4.6=Rs.36.8