Calculating Energy Costs and Usage

This video tutorial explains the concepts of kilowatts and kilowatt hours, and how to calculate power usage and costs for various household appliances. It provides examples using a plasma TV, a refrigerator, and an oven, demonstrating two methods for calculating energy consumption and cost. The tutorial aims to help viewers understand how to manage and estimate their energy usage effectively.

What is a kilowatt-hour a measure of?

• The power of a device

• The energy used by a 1,000 watt device in one hour

• The cost of electricity

• The voltage of a device

How do you calculate the number of kilowatt-hours used by a device?

• Subtract the hours from the watts

• Add the watts and hours

• Divide the total watts by 1,000

• Multiply the watts by the hours used

If a television uses 200 watts per hour, how many kilowatt-hours does it use in 75 hours?

• 10 kilowatt-hours

• 15 kilowatt-hours

• 20 kilowatt-hours

• 25 kilowatt-hours

What is the first step in calculating the monthly cost of running a refrigerator?

• Determine the total watts used in a month

• Find the cost per kilowatt-hour

• Calculate the daily usage

• Estimate the monthly usage

How many kilowatt-hours does a refrigerator use if it runs for 8 hours a day at 575 watts?

• 175 kilowatt-hours

• 138 kilowatt-hours

• 160 kilowatt-hours

• 150 kilowatt-hours

What is the cost of running a refrigerator for a month if the rate is 12 cents per kilowatt-hour and it uses 138 kilowatt-hours?

• $16.56

• $19.20

• $15.60

• $18.00

How many watts does an electric oven use if it is labeled as 4,000 watts?

• 2,000 watts

• 3,000 watts

• 5,000 watts

• 4,000 watts

How much does it cost to bake a cake for 30 minutes if the rate is 14 cents per kilowatt-hour and the oven uses 4,000 watts?

• 56 cents

• 42 cents

• 28 cents

• 14 cents

How long does it take to use 1 kilowatt-hour with a 4,000 watt oven?

• 60 minutes

• 45 minutes

• 30 minutes

• 15 minutes

If an oven is on for 30 minutes, how many kilowatt-hours does it use?

• 4 kilowatt-hours

• 3 kilowatt-hours

• 2 kilowatt-hours

• 1 kilowatt-hour