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Power Calculations

Last updated over 5 years ago

18 questions

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Question 1

1.

1. What is the formula linking power, current and voltage?

Question 2

2.

Rearrange this formula to calculate current.

Question 3

3.

Rearrange this formula to calculate voltage.

Question 4

4.

What is the formula linking power, current and resistance?

Question 5

5.

Rearrange this formula to find current.

Question 6

6.

Rearrange this formula to find resistance.

Question 7

7.

A kettle has a current of 10A and a p.d. of 230V. Calculate the power output.

Question 8

8.

A TV has a current of 80A and a p.d. of 230V. Calculate the power output

Question 9

9.

A toaster has a current of 20A and a p.d. of 230V. Calculate the power output

Question 10

10.

Work out the resistance for the kettle from question 7.

Question 11

11.

Work out the resistance for the TV from question 8.

Question 12

12.

Work out the resistance for the toaster from question 9.

Question 13

13.

The heating element in a kettle produces an output of 1200W using mains electricity. Calculate the current flowing through it.

Question 14

14.

A TV produces an output of 5000W using mains electricity. Calculate the current flowing through it.

Question 15

15.

A toaster produces an output of 2.5kW using mains electricity. Calculate the current flowing through it.

Question 16

16.

If the resistance of a kettle is 20Ω, with a power output of 2.2kW, what is the current flowing through it?

Question 17

17.

If the resistance of a TV is 70Ω, with a power output of 5kW, what is the current flowing through it?

Question 18

18.

If the resistance of a toaster is 20Ω, with a current flowing through it of 20A, what is the power output?