SELECT * FROM question_mgmt as q WHERE id=3826 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=263 and ex_no='8' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Electricity an electric heater of resistance 8 omega draws 1

Question:

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.

Answer:

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.


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