Electricity Usage and Cost Calculations

This video tutorial explains the cost of electricity, focusing on factors affecting the cost of running appliances. It covers the importance of understanding units like kilowatt hours, and how to calculate energy costs using these units. The video provides practical examples and guides on converting units and time, ultimately teaching how to calculate the cost of electricity usage effectively.

What is the primary factor that affects the cost of running an appliance?

• The size of the appliance

• The brand of the appliance

• The power it uses and the time it's on

• The color of the appliance

Why do we use kilowatt-hours instead of joules to measure electricity usage?

• Kilowatt-hours are easier to calculate

• Joules are not a unit of energy

• Kilowatt-hours are a larger unit, making numbers more manageable

• Joules are only used in chemistry

If an appliance uses 3 kilowatts of power for 6 hours, how many kilowatt-hours does it consume?

• 18 kilowatt-hours

• 12 kilowatt-hours

• 36 kilowatt-hours

• 6 kilowatt-hours

How do you convert 2,500 watts to kilowatts?

• Divide by 100

• Multiply by 1,000

• Multiply by 100

• Divide by 1,000

What is the conversion factor for turning minutes into hours?

• Add 60

• Divide by 60

• Subtract 60

• Multiply by 60

What should you do if given power in watts for a calculation?

• Convert it to kilowatts by dividing by 1,000

• Convert it to joules by multiplying by 1,000

• Convert it to megawatts

• Leave it as watts

If you have a 400 watt television on for 6 hours and 15 minutes, how many kilowatt-hours does it use?

• 2.5 kilowatt-hours

• 1.5 kilowatt-hours

• 3.5 kilowatt-hours

• 4.5 kilowatt-hours

What is the cost of 8 kilowatt-hours if each costs 11 pence?

• 110 pence

• 80 pence

• 100 pence

• 88 pence

Why is it unnecessary to memorize the cost of electricity per unit?

• It is always the same

• It varies by provider and time

• It is not used in exams

• It is a fixed government rate

How do you calculate the total cost of electricity used?

• Subtract the cost per unit from the number of units

• Multiply the number of units by the cost per unit

• Add the number of units to the cost per unit

• Divide the number of units by the cost per unit