How much energy is consumed when a current of 5 amperes flows through the filament of a heater having resistance of 100 ohms for two hours? Express it in joules
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Answered by
298
Given:
Current (I) = 5 A
Resistance(R ) = 100 Ω
Time (t) = 2 h
Power( P) = I²R
P = (5)² × 100 watt
P = 25 × 100
P = 2500 watts
P =2.5 kW
[ 1 watt = 1/1000 kW]
Energy consumed (E) = P x t
[The electrical 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 x 2
E = 5 kWh
•The commercial unit of electrical energy is kilowatt hour (kWh).
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.
HOPE THIS WILL HELP YOU..
Current (I) = 5 A
Resistance(R ) = 100 Ω
Time (t) = 2 h
Power( P) = I²R
P = (5)² × 100 watt
P = 25 × 100
P = 2500 watts
P =2.5 kW
[ 1 watt = 1/1000 kW]
Energy consumed (E) = P x t
[The electrical 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 x 2
E = 5 kWh
•The commercial unit of electrical energy is kilowatt hour (kWh).
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.
HOPE THIS WILL HELP YOU..
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94
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