Describe how to investigate the factor of heating that affects the resistance of electrical circuits

A second problem with the resistance practical is heating effects: if the temperature of the wire increases the resistance will also increase which will affect results. Heating effects can be reduced by using a low potential difference which will keep the current low, reducing any heating in the wire. Secondly the current should only be turned on when taking a readying, it should be turned off between readings which will also reduce heating effects