There are different ways to investigate the factors that affect resistance. In this required practical activity, it is important to:
To investigate how changing the length of the wire affects its resistance.
Some example results may be:
|Length (cm)||Potential difference (V)||Current (A)||Resistance (Ω)|
From the graph it can be seen that the longer the piece of wire, the higher the resistance, and that resistance is directly proportional to length as the graph gives a straight line through the origin.
|Heating of the resistance wire||Burns to the skin||Do not touch the resistance wire whilst the circuit is connected and allow time for the wire to cool.|