P2 Physics - ac, mains electricity, wiring a plug, energy transfer

Question 1

what is alternating current

Answer 1

the current consistently changes direction

Question 2

what does the mains electricity cable contain?

Answer 2

2 or 3 inner wires

Question 3

what are the three colours of wire inside a cable?

Answer 3

blue
brown
green/yellow striped

Question 4

what does the blue wire mean?

Answer 4

neutral

Question 5

what does the brown wire mean?

Answer 5

live

Question 6

what does the green/yellow wire mean?

Answer 6

earth

Question 7

what are 3 features of the plug?

Answer 7

there is a fuse
covered with plastic, good electrical insulators
has three pins made of brass - good conductor of electricity

Question 8

where does each wire go?

Answer 8

bLue - Left
bRown - right
sTriped - top

Question 9

what does the amount of electrical energy transfered to an appliance depend on?

Answer 9

power and length of time it is switched on

Question 10

whats the equation to show the reltionship between energy transfered, power and time

Answer 10

energy transfered = power x time