What do electrical appliances usually display a power rating in?

What is the word equation for power by voltage?

PRACTICE QUESTION
What is the power rating of a kettle working at 9 amps (A) on the mains supply of 230 volts (V)?

What is the word equation for energy supplied by power?

What is the unit of electrical energy used in the home?

What is the word equation for cost of electricity used by energy used?

PRACTICE QUESTION
Calculate the cost of using a 250 W television for 30 minutes if one kWh of electricity costs 10p?

Why do we pay less for electricity during the night?

Some energy sources are more appropriate than others in a particular situation.
The choice of energy sources depends on which several factors?

What is the National Grid?

In the National Grid what are transformers used for?

What does the high voltage lead to?

What are transformers then used again for?

When a current passes through a wire the wire gets hot. The greater the current, the hotter the wire:
- what happens when a transformer increases the voltage?