Question 17
An electric heater of resistance $8 Ω$ draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

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Solution

Rate of heat produced by a device is given by the expression for power as, $P = I^{2} R$
Where, resistance of the electric heater, $R = 8 Ω$
Current drawn, I = 15 A
$P = (15)^{2} \times 8 = 1800 J / s$
Therefore, heat is produced by the heater at the rate of 1800 J/s.

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Question 17 An electric heater of resistance 8Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Rate of heat produced by a device is given by the expression for power as, P=I2R Where, resistance of the electric heater, R=8Ω Current drawn, I = 15 A P=(15)2×8=1800J/s Therefore, heat is produced by the heater at the rate of 1800 J/s.

Question 17
An electric heater of resistance $8 Ω$ draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Rate of heat produced by a device is given by the expression for power as, $P = I^{2} R$
Where, resistance of the electric heater, $R = 8 Ω$
Current drawn, I = 15 A
$P = (15)^{2} \times 8 = 1800 J / s$
Therefore, heat is produced by the heater at the rate of 1800 J/s.