Question

You are looking at your power bill for the month, you pay 11 cents per kilowatt-hour. running a 60 watt light bulb for 1 hour is .06 kwh, if you leave a light on all the time that has 3 light bulbs in it how much would that cost in a 30 day month? answer in the form of $2.54 without the dollar sign.

Answer 1

Electrical energy consumption is measured at kilowatt-hour (KWh). Thus the cost of energy consumed for the month is $28.512

What does kilowatt-hour mean?

• One kilowatt of power over the course of one hour is a kilowatt-hour of energy.
• As an example, a 100-watt light bulb would need 10 hours to consume 1kWh, whereas an oven would consume that same 1kWh amount in about 30 minutes.

The rate of consumption of energy is measured in kilowatt-hour.

In the given question

11 cent is paid per kilowatt-hour.

60 watts of light for 1 hour = 0.06 KWh

3 light bulbs of 60 Watts each for 1 hour = 3 x  0.06

                                          = 0.18 KWh

But,

30 days = 30 x 24 hours

                       = 1440 hours

The total energy consumed for the month = 1440 x 0.18

                                     =  259.20 KWH

The total cost for the month = 0.11 x 259.20

                                              = $28.512

Thus, the total cost for the month is $28.512

Learn more about kilowatt-hour

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