Domestic Electricity Flashcards
What do AC and DC stand for?
Alternating Current and Direct Current.
What kind of electric current does a battery use?
Direct Current.
What kind of current is in use in scenarios of constant electronic supply?
Alternating Current.
How does direct current work?
Direct Current maintains a constant voltage: electrons move in a single direction.
How does alternating current work?
The current constantly changes direction: how often this happens is the measure of frequency.
What is the unit of frequency?
Hertz (Hz).
At 50 Hz, how often does the direction of electrons change?
50 times per second.
What is the charge of British Mains power?
230V.
What is amplitude the measure of?
The peak of a wave.
What is the measure of the length of a wave?
Wavelength.
How do you determine the frequency of a current?
Divide one by the time for one cycle.
What does a blue wire represent?
The neutral wire.
What does the striped yellow and green wire represent?
The earth wire.
What does the brown wire represent?
The live wire.
Which feature of a plug maintains the position of the wire?
The cable grip.
Which wire is the fuse attached to?
The live wire.
What is the job of the live wire?
To carry the current into the appliance.
Which wire carries the current into the appliance?
The live wire.
Which wire completes the circuit and carries the current out of the appliance?
The neutral wire.
What is the job of the neutral wire?
To complete the circuit and carry the current out of the appliance.
When is an earth wire necessary?
When the plug case is not plastic.
What happens if the live wire touches a metal case?
There’s a short circuit.
What is the job of the earth wire?
To remove the current if the live wire causes a short circuit.
What are fuses?
A safety device designed to prevent fires.
