electricity - power of components and DC/AC supply

Question 1

what is the power equation

Answer 1

power = potential difference x current

Question 2

if we know the current through a component and the resistance of a component what can we calculate

Answer 2

power of that component
power = current squared x resistance

Question 3

true of false
the current from a cell only moves in one direction

Answer 3

true

Question 4

what type of current is the one that leaves a cell

Answer 4

direct current - DC

Question 5

what happens to the current if you replaced the cell with a mains power supply

Answer 5

the current becomes an alternating current meaning it changes direction AC

Question 6

what is the benefits of using an ac current

Answer 6

its much easier to sue a transformer to increase or decrease the potential difference

Question 7

in the uk what is the frequency of the alternating current

Answer 7

50 Hz

Question 8

in the uk what is the potential difference of the alternating current

Answer 8

around 230 volts

Question 9

how can scientists see the pattern of an electrical current

Answer 9

using a an oscilloscope

Question 10

how is the potential difference for a direct current compared to an alternating current

Answer 10

a direct current the potential difference doesnt change

Question 11

for an alternating current, what does the time from one peak to the next peak show us

Answer 11

one complete cycle