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

The resistance practical has a small resistance when the length of the wire is zero, this called zero error which is a reading on the measuring instrument when the value should be zero; it’s a systematic error that can’t be reduced by carrying out repeats. In the case resistance, the zero error needs to be subtracted from all the readings. This systematic error is caused by the equipment because it’s impossible to get the crocodile clip on the zero position on the ruler and there is also some resistance caused by the contact between the crocodile clip and the wire.