Per day?

Electricity and Magnetism Level 3

Each few bulbs of 60 W are used for 6h everyday. The cost of electricity per kWh unit is $3 and the monthly electric bill is $162.

How many bulbs are used per day?


The answer is 5.

Munem Shahriar by Munem Shahriar , 18, Bangladesh

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1 solution

Tom Engelsman
Aug 29, 2017

If the cost of electricity is $3/kWh and assuming 30 days in the month, the required number of bulbs, N, computes according to:

( $ 3 k W h ) ⋅ ( 1 k W 1000 W ) ⋅ ( 60 W ⋅ N ) ⋅ ( 30 ⋅ 6 h ) = $ 162 (\frac{\$3}{kWh}) \cdot (\frac{1 kW}{1000 W}) \cdot (60W \cdot N) \cdot (30 \cdot 6h) = \$162

or N = 5 b u l b s . N = \boxed{5} bulbs.

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