current, resistance & pd

Question 1

what is electric current?

Answer 1

flow of electrical charge

Question 2

what does there need to be for current to flow?

Answer 2

a source of potential difference

Question 3

what is current measured in?

Answer 3

amps

Question 4

what does the size of current depend on?

Answer 4

resistance and potential difference

Question 5

what happens to the current as the resistance increases?

Answer 5

it decreases

Question 6

charge

Answer 6

current x time/Q=It

Question 7

give units for charge equation

Answer 7

current-amperes
charge-coulombs
time-seconds

Question 8

what direction does current flow v conventional current?

Answer 8

negative to positive, conventional is positive to negative

Question 9

what do the electrons carry?

Answer 9

energy from the cell

Question 10

what happens to the energy the electrons carry?

Answer 10

it is passed to the components in the circuit

Question 11

how can you measure current?

Answer 11

using an ammeter

Question 12

what is the size of electric current?

Answer 12

the rate of flow of electrical charge

Question 13

what is potential difference?

Answer 13

the driving force that pushes the charge round

Question 14

potential difference equation

Answer 14

current x resistance (V=IR)

Question 15

units for pd equation

Answer 15

pd-volts
current-amps
resistance-ohms

Question 16

what does resistance tell us?

Answer 16

the potential difference required to drive a current through a component