alternating and direct current. AC & DC.

Question 1

DC: supply has what?

Answer 1

potential difference that is always positive or always negative.- the current direction is constant.
type of current that is supplied by cells and batteries.

Question 2

AC: supply has what?

Answer 2

potential difference that alternates from positive to negative.- current direction alternates.
type of current used in mains electricity.

Question 3

what does a DC look like on a chart?

Answer 3

straight line above the line of 0.

Question 4

what does an AC look like on a chart?

Answer 4

a line that starts below but touching the line representing zero and fluctuates up and down, above and below the line and come to a stop on the top of the line touching it.