In a house 10 bulbs of power 10W each, 1 fan of power 100W runs
for 10 hrs daily. Calculate the amount of electrical energy consumed at the
end of month November . Also calculate the cost if cost per unit is Rs 10.
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Power = energy/ time
energy = power × time
power of 1 bulb = 10 w = 0.01 kilowatt
time = 10 hrs
in case of bulb
energy consumed by 1 bulb = 0.01 × 10 = 0.1 kwh
energy consumed by 10 bulbs = 10 × 0.1 = 1 kwh
in case of fan
power of 1 fan = 100w = 0.1 kwh
energy consumed by 1 fan = 0.1 × 1 = 0.1 kwh
total energy consumed = energy consumed by bulb + energy of fan (1 + 0.1 = 1.1 kwh)
1 Kwh = 1 unit
total unit of energy consumed = 1.1 kwh
Cost of energy for 1 unit = Rs 10
total cost 1.1 × 10 = 11 rs
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