1. What is the formula linking power, current and voltage?
Rearrange this formula to calculate current.
Rearrange this formula to calculate voltage.
What is the formula linking power, current and resistance?
Rearrange this formula to find current.
Rearrange this formula to find resistance.
A kettle has a current of 10A and a p.d. of 230V. Calculate the power output.
A TV has a current of 80A and a p.d. of 230V. Calculate the power output
A toaster has a current of 20A and a p.d. of 230V. Calculate the power output
Work out the resistance for the kettle from question 7.
Work out the resistance for the TV from question 8.
Work out the resistance for the toaster from question 9.
The heating element in a kettle produces an output of 1200W using mains electricity. Calculate the current flowing through it.
A TV produces an output of 5000W using mains electricity. Calculate the current flowing through it.
A toaster produces an output of 2.5kW using mains electricity. Calculate the current flowing through it.
If the resistance of a kettle is 20Ω, with a power output of 2.2kW, what is the current flowing through it?
If the resistance of a TV is 70Ω, with a power output of 5kW, what is the current flowing through it?
If the resistance of a toaster is 20Ω, with a current flowing through it of 20A, what is the power output?