Cost Of Electricity

Question 1

What does the amount of energy transferred by an appliance depend on?

Answer 1

It’s power

Amount of time

Question 2

What is energy measured in?

Answer 2

J

Question 3

What is the equation for energy?

Answer 3

Energy = power (times) time

Question 4

When you are dealing with large amounts of electrical it’s easier to think of power and time in…..

Answer 4

Kilowatts and hours

Question 5

A kilowatt hour is the amount of electrical energy used by…

Answer 5

1kw appliance left on for 1 hour

Question 6

What are the 2 formulas for calculating the cost of electricity?

Answer 6

kWh used = power- kW (times) time (in hours)

Cost = units (times) price per unit

Question 7

When you are given two meter readings and asked to work out the total energy that has been used over a period of time what do you do?

Answer 7

You subtract the big number from the small number

Question 8

Electrical appliances ……….. Electrical energy in to other forms

Answer 8

Transfer