What are the first six steps method of finding the resistance of a wire?
Complete the circuit. Make sure distance between crocodile clips is 10cm
Increase the voltage on the powerpack until the ammeter reading increases to 0.50A
record the current/potential difference ( from the voltmeter )
!Do not adjust the dial on the powerpack!
move the right hand crocodile clip further down the wire so the distance is 20cm
Increase by 10cm until you reach 100cm
What are the next 5 steps of finding the resistance of a wire?
Repeat at least 3x to make it repeatable and to calculate a mean
Calculate resistance using voltage = current x resistance -
rearrange to R = V ÷ I
Independent variable - length of wire
Dependant variable - resistance
IV graph - resistance of a wire
Why does the resistance increase?
Current is the flow of electrons when these electrons flow through a wire they collide with the ions in the wire, this is resistance.
The longer the wire, the more collisions so the resistance increases. This also produces wastes thermal energy so wires get hot which also increases resistance
As you increase the length, you increase the resistance. It us directly proportional even though it does not go through the origin.
The reason it does not go through the origin is because the crocodile clips is used to attach the wires has resistance of there own. This is a systematic error.
