resistance and i-v characteristics

V= I x R

resistance is anything in a circuit that reduces the flow of current-measured in ohms

the greater the resistance of a component the smaller a current that flows

the resistance of an ohmic conductor doesnt change with the current

the current flowing through an ohmic conductor is directly proportional to the potential difference across it

other components arent ohmic and their resistance changes with the current through them

how to investigate how the length of a piece of wire affects the resistance of a circuit:

one crocodile clip attached to a wire at a 0cm position which stays fixed there for the investigation

the second crocodile clip is moved along the test wire.

record the length between the two crocodile clips and then record the current shown on the ammeter and pd shown on the voltmeter after closing the switch.

repeat this at different lengths.

graph made should be a straight line through the origin showing that the resistance is directly proportional to length-longer the wire greater the resistance

i-v characteristics show how the current varies as you…