An electric heater of resistance 8 ohm draws 15C of charge per second. Suppose it happens for a period of 2 hours calculate the amount of heat energy derived by the heater?
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Given parameters
The resistance of the electric heater (R) = 8 Ω
Current drawn (I) = 15 A
Time = 2 hrs
T = 120 min x 60
Time (T) = 7200 secs
The rate of heat produced by the device in terms of power is expressed as
The heat developed in heater can be calculated using the formula
H = I2RT
H = 15 x 15 x 8 x 7200
H = 12960000
H = 1296 x 104 J
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