SELECT * FROM question_mgmt as q WHERE id=4220 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=191 and ex_no='5' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Work and Energy find the energy in kw h consumed in 10 hours by fo

Question:

Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

Answer:

Power of one device, P = 500 W = 500 / 1000 = 0.50 kW

Power of four devices = 500 x 4 = 2000 W = 2000 / 1000 = 2 kW

Time taken, T = 10 h

We know that

Power = energy consumed / time 

Energy consumed = Power × Time

= 2 × 10 = 20 kWh

Therefore, the energy consumed by four equal rating devices in 10 h will be 20 kWh.


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