Connect the crocodile clips to the resistance wire, 100 centimetres (cm) apart. plot a graph of resistance against length for the resistance wireįrom the graph it can be seen that the longer the piece of wire, the greater the resistance, and that resistance is directly proportional to length as the graph gives a straight line through the origin. Connect the circuit as shown in the diagram above.
use the results to calculate the resistance of each length of wire by using \(R = V/I\), where R is resistance, V is potential difference and I is current.repeat the previous steps reducing the length of the wire by 10 cm each time down to a minimum length of 10 cm User vigorousbeast5219 uploaded this Digital Audio Out Wire - Alternating Current Crocodile Clip Electricity Electric Current Electrical Cable PNG PNG image.record the new readings on the ammeter and the voltmeter.