quiz 12 Flashcards
1
Q
What does the word frequency mean in physics?
A
Number of cycles per second
2
Q
Describe the potential difference of an ac supply
A
Continuously reverses polarity
3
Q
What does dc stand for?
A
Direct current
4
Q
State the unit of frequency.
A
hertz or Hz
5
Q
Describe direct current.
A
Current that is always in the same direction
6
Q
Are batteries dc or ac?
A
dc
7
Q
Describe alternating current.
A
Current repeatedly reverses direction
8
Q
Is the mains supply dc or ac?
A
ac
9
Q
What does ac stand for?
A
Alternating current
10
Q
What is the potential difference of the domestic ac supply in the UK
A
230 V
11
Q
What is the frequency of the domestic ac supply in the UK?
A
50 Hz
