P2.5 Mains Electricity Flashcards
1
Q
Define potential difference
A
Difference in electrical energy between two points (the amount of energy carried by each charge)
2
Q
Define alternating current
A
Voltage alternates between positive and negative
3
Q
In a plug, what colour is the:
i) neutral wire
ii) live wire
iii) earth wire
A
i) blue
ii) brown
iii) striped
4
Q
Why are the pins made from brass?
A
It is a good conductor and a strong/hard metal
5
Q
Why is the case plastic?
A
It insulates the plug and separates the wires
6
Q
Why are thicker cables used for wall sockets?
A
They can cope with a higher current
7
Q
Define power
A
Energy transferred to an appliance each second
8
Q
Define current
A
Charge that flows through an appliance each second
