Question

answer the question no 29 please

Answer 1

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