Question

A room has a 60 Watt, a 100 Watt and a 150 Watt light bulb. How much does it
cost to use all the lamps for 2.5 hours at $0.08/ kWh?

Answer 1

The cost to use all lamps is $62.

• room has 60 watts, 100 watts, and 150 watt light bulbs.
• Duration of using bulbs=2.5 hours

• power =$0.08kWh

           power=energy/time

          (60+ 100+150)=energy/2.5

          energy=775 joule

cost for 1 hour=$0.08

                      = 775 * 0.08

                     = $62

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