Middle School

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Your utility company charges 13 cents per kilowatt-hour of electricity. What is the daily cost of keeping a 100-watt light bulb lit for 13 hours each day?

Answer :

Answer:

16.9 cents

Step-by-step explanation:

We are given the following information;

  • Charge per kWh is 13 cents
  • A bulb of a 100 Watt
  • Number of hours in use 13 hours a day

Required to determine the daily cost of operating the bulb;

First, we will need to calculate the number kilowatts

Note: 1 kW = 1000 W

Power needed = (100 watt × 13 hours) ÷ 1000

= 1.3 kWh

But;

1 kWh = 13 cents

Therefore;

Cost = 1.3 kWh × 13 cents per kWh

= 16.9 cents

Thus; the daily cost of operating the bulb is 16.9 cents

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Rewritten by : Barada