P5 - Electricity In The Home need to finish Flashcards
1
Q
In the UK what is the standard voltage and frequency of a domestic electricity supply?
A
230 V
50 Hz
2
Q
What is direct current (DC)?
A
Direct current is where the current flows in the same direction caused by a direct voltage
3
Q
What is alternating current?
A
The current is constantly changing direction.
The frequency of UK mains is 50Hz meaning the current switches directions 50 times per second
4
Q
What is equation that links power and current?
A
Power = potential difference x current
P = V x I
5
Q
What is the equation that links power and resistance ?
A
Power = current^2 x resistance
P = I^2 x R
