AC & DC Flashcards

All 4 cards in this deck

What are the frequency and potential difference of the UK domestic mains electricity supply?

A frequency of $50\ Hz$ and a potential difference of about $230\ V$.

What is an alternating potential difference (ac)?

A potential difference that repeatedly changes direction, so the current it produces also keeps changing direction.

What is a direct potential difference (dc)?

A potential difference that is always in the same direction, so the current flows in one direction only.

True or false? A cell or battery supplies an alternating potential difference.

False. Cells and batteries supply a direct potential difference; mains electricity is the ac supply.