direct and alternating potential difference

Question 1

state whether mains electricity is an ac or dc supply.

Answer 1

AC (Alternating Current) supply

Question 2

recall the frequency of the UK mains electricity supply.

Answer 2

50 Hertz

Question 3

recall the potential difference of the UK mains electricity supply.

Answer 3

230 Volts

Question 4

explain the difference between direct and alternating potential difference.

Answer 4

Direct potential difference (DC) maintains a constant polarity and voltage, forcing current to flow in only one direction. Alternating potential difference (AC) continuously reverses polarity, causing current to change direction and magnitude periodically, typically in a sinusoidal wave