NCERT Solution for Class 10 Science Chapter 12
Electricity
NCERT Books for Session 2020-2021
CBSE Board and UP Board
Exercises Questions
Page No-222
Questions No-17
An electric heater of resistance 8 W draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
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Heat developed in the heater is given by H = I2Rt
Where, I = 15 A, R = 8 Ω and time t = 2 hours
The rate at which heat is developed is given by
𝐻=𝐼²𝑅𝑡/𝑡=𝐼²𝑅=(15)²×8=1800 𝐽/𝑠
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Rate of heat produced by a device is given by the expression for power as
P = I2R
Where,
Resistance of the electric heater, R = 8 Ω
Current drawn, I = 15 A
P = (15)2 x 8 = 1800 J/s
Therefore, heat is produced by the heater at the rate of 1800 J/s.