Question

How much energy is consumed when a current 5A flows through the filament of a heater having resistance of 100ohms for two hours? Express it in joules.​

Answer 1

Given:

Current(I)= 5A

Resistance(R) =100Ω

Time(t) =2h

Power(P) L

2

R

P=(5)

2

×100watt

P=25×100

P=2500watts

P=2.5kW

[1watt=1/1000kW]

Energy consumed E=p×t

[ The electric energy consumed by an electrical appliance is given by the product of its power rating and the time for which it is used.]

E=2.5×2

E=5kWh

The commercial unit of electrical energy is kilowatt hour (kWh).

P=2500watts

P=2.5kW

[1watt=1/1000kW]

E=5×3.6×10

6

J

[1kWh=3.6×10

6

J]

E=18.0×10

6

J

Hence, the energy consumed is 18.0×10

6

J.

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Answer 2

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