In a classroom 2 bulbs of 60W each and 2 fans of 40W each are used for 6h a day.
One day there was a power cut students forgot to switch “OFF” the fans and the bulbs.
Following day the students realised that all the fans and the bulbs are “ON”. They
calculated the wastage of energy for 18h.
Answer the following Questions.
(i) Write about the energy conversion involved when you turn ON a fan.
(ii) A bulb is rated 60W. What do you understand by this?
(iii) If the cost of each unit is Rs. 7.50. Calculate the money paid by the school for the
‘one day wastage of electrical energy’.
(iv) What lesson do you learn from this situation?
Answers
Answer:
I don't know the first answer, but I know the rest of them
(ii) 1 joule of energy has been used in a sec is known as one watt
(iii) 27000
iv) We should not waste energy otherwise it isn't good for the environment either. Many of the energy sources we depend on, like coal and natural gas, can't be replaced – once we use them up, they're gone forever. Plus we have to pay more money, which is also a waste of money.
Explanation:
ii)Power of the two bulbs= 2x60=120W= 0.12KW
power of the two fans= 2x40=80W= 0.08KW
Energy used in that day= Power of the two bulbs + Power of the two fans x 18h=0.12+0.08 x 18= 2.304KWh=2.304 units
Rate of cost of each unit= Rs.7.50
Total money to be paid as the bill for the consumption of energy= 7.50 x 2.304= Rs. 17.28
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