Mains Electricity Flashcards
What can electric shocks from a high voltage source cause?
Pain and Death
How does a direct current flow?
In one direction at a constant rate
How does an alternating current flow?
Switches many times each second
What do all countries use for their mains electricity?
A.C. supplies
What happens when there is a current in a resistor?
Electrical transfer of energy and a rise in temperature
What does the wire in a fuse do if the current is too high?
Heats up and melts
What does a circuit breaker do when current is too big?
Opens to stop the current.
What does an earth wire prevent?
Electrical shocks.
What materials are used to make insulating materials?
Materials that do not conduct electricity.
What is double insulation in appliances?
An appliance made of insulating material don’t need an earth wire.
