Electricity In The Home Flashcards
1
Q
Describe the electrical supply in a home
A
240v
50 hertz
Alternating current
2
Q
What 50 hertz mean
A
The current is changing direction 50 times a second
3
Q
What are the names of the three wires found in a plug
A
Live (brown)
Neutral (blue)
Ground (green)
4
Q
What is the equation for potential difference
A
Potential difference = current x voltage
5
Q
What is 1 KWH equal to
A
3.6 MJ
6
Q
How do you work out cost
A
Cost = cost per unit x number of units
Or
Cost = power in KW x time in hours x unit cost
