safe electricals Flashcards
1
Q
what does a variable resistor/rheostat do?
A
changes the resistance
2
Q
what type of wire increases the resistance?
A
either long or thin
3
Q
what is the formula for resistance?
A
resistance= voltage
current
4
Q
what is resistance measured in?
A
ohms
5
Q
what does the ‘live wire’ do in a home?
A
carries a high voltage around the house
6
Q
what does the ‘neutral wire’ do in a home?
A
completes the circuit, providing a return path for the current
7
Q
what does the ‘earth wire’ do in a home?
A
the earth wire is connected to the case of an appliance to prevent it becoming live
8
Q
what does a fuse contain?
A
it contains a wire which melts, breaking the circuit, if the current becomes too large
