List the names of three electrical gadgets used in your house. Write their power, voltage rating and approxiamate time for which each one is used in a day. Hence find the electrical energy consumed by each in a day.

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Solution

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$l e t t h e t h r e e c o m p o n e n t a n d t h e i r r a t i n g B u l b 220 V - 100 W F a n 220 V - 200 W C o o l e r 220 V - 500 W t h e s e e q u i p m e n t a r e u s e d f o r t h e 5 h r i n a d a y t h e n e n e r g y c a l c u l a t i o n B u l b : P o w e r P = 100 W = 0.1 k W t i m e 5 h r E n e r g y E = P \times t = 0.1 \times 5 = 0.5 k W h F a n : o w e r P = 200 W = 0.2 k W t i m e 5 h r E n e r g y E = P \times t = 0.2 \times 5 = 1.0 k W h C o o l e r : o w e r P = 500 W = 0.5 k W t i m e 5 h r E n e r g y E = P \times t = 0.5 \times 5 = 2.5 k W h$

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