Question

An energy-saver light-bulb of 11W gives the same illumination as a conventional 60W light-bulb. a typical light-bulb is used on average for five hours a day, how much energy is saved per year by one light-bulb? 2. If each household used eight such light-bulbs, and there are 20 mi- lion households in a country, how much energy would that country save annually?​

Answer 1

Answer:

1- 11 watt is 49 watts less then 60 watts.

So 49 watts x 5 hours = 245 Wh /1000 = 0.245 Kwh savings a day. 0.245 Kwh x 365 = 89.42 Kwh.

One such lightbulb saves 89.42 Kwh a year.

More precisely 89.425 Kwh

Explanation:

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