8. An electric bulb of 60W is used for 6hrs per day. Calculate the units of energy consumed in one day by
the bulb. Also find the cost of energy consumed in the month of April if 5 such bulbs are used for 6hrs
per day at the rate of Rs. 4.50 per unit.
9. State the law of conservation of energy.
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Explanation:
power of bulb=60W
time taken=6,hrs
power = energy consumed/time taken
energy consumed=power*time taken
=60*6
=360Wh
.law of conservation says that energy neither be created nor be destroyed
Energy only transform one body to another body
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