A tablet charger uses 15 watts and it takes 5 hours to fully charge. The cost of electricity is $0.15/kWh. a. If this tablet is fully charged once a day. How many kWh does it use each year? (Remember to convert watts to kilowatts) b. What is the annual cost of charging this tablet?

Answers

Answer 1

Note that he annual cost of charging the tablet is approximately $4.11.

What is the explanation for the above response?


a. To calculate the kWh used each year, we first need to calculate the total energy used to fully charge the tablet once. Energy = Power x Time, so the energy used to charge the tablet once is:

Energy = 15 watts x 5 hours = 75 watt-hours (Wh)

To convert watt-hours to kilowatt-hours (kWh), we divide by 1,000:

75 Wh ÷ 1,000 = 0.075 kWh

So, the tablet uses 0.075 kWh of electricity to fully charge once. If it is charged once a day, it will use 0.075 kWh x 365 days = 27.375 kWh per year.

b. To calculate the annual cost of charging the tablet, we need to multiply the kWh used per year by the cost of electricity per kWh:

27.375 kWh x $0.15/kWh = $4.10625 per year

Therefore, the annual cost of charging the tablet is approximately $4.11.

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One example in the film Scream (1996) that brings a surprising amount of comedy is the scene where Randy Meeks (played by Jamie Kennedy) is explaining the "rules" of a horror movie to a group of teenagers at a party.

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