Question

Suppose in house there are four bulbs of 100 W each, six of 60W each and six of 40 W each. All
of them are used for two hours a day. How many units of electricity will be used up in 30 days?
How much will they have to pay at Rs. 2.80/- per unit.​

Answer 1

Explanation:

●Energy consumed by electric bulb = power of the bulb ⨯ Time Energy consumed by electric bulb of 100 w = 100 w ⨯ 30 ⨯ 2 hrs Energy consumed by electric bulb of 100 w = 3000 watt-Hour Energy consumed by electric bulb of 100 w = 3 kilo watt-Hour Energy consumed by four bulbs each of 40 w = Number of the bulbs ⨯ power of each bulb ⨯ Time Energy consumed by four bulbs each of 40 w = 4 ⨯ 40 w ⨯ 4 hrs ⨯30 Energy consumed by four bulbs each of 40 w = 19200 watt - Hour Energy consumed by four bulbs each of 40 w = 19.2 kilowatt – Hour Total energy consumed = Energy consumed by electric bulb of 100 w + Energy consumed by four bulbs each of 40 w Total energy consumed = 3 kilo watt-Hour + 19.2 kilowatt – Hour Total energy consumed = 22.2 kilo watt-Hour.

Answer 2

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Explanation:

●Energy consumed by electric bulb = power of the bulb ⨯ Time Energy consumed by electric bulb of 100 w = 100 w ⨯ 30 ⨯ 2 hrs Energy consumed by electric bulb of 100 w = 3000 watt-Hour Energy consumed by electric bulb of 100 w = 3 kilo watt-Hour Energy consumed by four bulbs each of 40 w = Number of the bulbs ⨯ power of each bulb ⨯ Time Energy consumed by four bulbs each of 40 w = 4 ⨯ 40 w ⨯ 4 hrs ⨯30 Energy consumed by four bulbs each of 40 w = 19200 watt - Hour Energy consumed by four bulbs each of 40 w = 19.2 kilowatt – Hour Total energy consumed = Energy consumed by electric bulb of 100 w + Energy consumed by four bulbs each of 40 w Total energy consumed = 3 kilo watt-Hour + 19.2 kilowatt – Hour Total energy consumed = 22.2 kilo watt-Hour.