TOPIC 10 - CHARGE AND ELECTRICITY Flashcards
1
Q
Advantage of circuit breaker
A
If a problem is fixed, a circuit breaker can be switched back on and also works quicker
2
Q
What are circuit breakers?
A
- they are alternatives to fuses
- automatic switches which turns off if it detects a current which is too high in a circuit
3
Q
What are fuses?
A
- Early warning system to prevent appliances being damaged by surges in electricity
- Thin wire with high resistance
- If the current is too high it breaks the circuit
- Protects the cable from overheating
- Fuse is made of insulating material
4
Q
Neutral wire
A
Returns current to the supply company to complete the circuit. 0V
5
Q
Live wire
A
Connected directly to the generators of the electrical company. 230V
6
Q
Earth wire
A
Usually carries no current, it’s a safety device usually at 0V
7
Q
In the UK what is frequency and voltage of the A.C mains
A
Frequency - 50Hz
Voltage - 230V
