Electrical - Power Flashcards
1
Q
Define electrical power.
A
Is the rate at which electrical current flows through a circuit.
P = IV
2
Q
What is the unit of electrical power?
A
Watt (W)
3
Q
How many Watts make 1 Horsepower?
A
746W
4
Q
What is a danger of passing a constant high current through a conductor?
A
Over-production of heat, which causes damage to conductor/Insulation.
5
Q
Name 2 types of fuse.
A
- Cartridge fuse
- HRC (high rupturing capacity)
6
Q
What does the fuse protect from damage?
A
A power supply or source
7
Q
What happens to the quartz powder in a HRC fuse when the fuse blows and what does this prevent?
A
The quartz powder melts and fills the gap between the two fuse wire ends. Quartz is an insulator, so no arc is possible.
8
Q
What is the electrical potential of the sea?
A
0 Volts
9
Q
List 3 things than can cause an earth fault in a circuit.
A
- Dampness
- Insulation becoming hard or brittle with age or heat
- Accidental damage
