Alternating current Flashcards
(9 cards)
1
Q
what does direct current do
A
flows in one direction
2
Q
what does alternating current do
A
repeatedly reverses its direction of flow
3
Q
a mains circuit has a live wire which is alternatively what
A
positive ans negative every cycle
4
Q
how many volts does a neutral wire have
A
0
5
Q
the peak potential difference of an ac supply is what
A
the maximum voltage measured from zero volts
6
Q
a typical power station generated electricity at an alternating potential difference of…
A
25000 V
7
Q
what are step up transformers used for
A
- at power stations to transfer electricity to the national grid
- used to make size of he alternating potential difference much greater
8
Q
what are step down transformers used for
A
used to supply electricity from the national grid to consumers
9
Q
homes in the uk are supplied with mains electricity that provide the sea power as…
A
230V direct- current supply
