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

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Solution

Rate at which heat is developed = Power
$= I^{2} R = 15^{2} \times 8 = 1800 W$

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Q. Question 17
An electric heater of resistance

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An electric heater of resistance 8 ohms draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater. (Give your answer in $\frac{J}{s}$ )

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

Rate at which heat is developed = Power =I2R=152×8=1800 W

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

Rate at which heat is developed = Power
$= I^{2} R = 15^{2} \times 8 = 1800 W$