Earth resistance is defined as the resistance offered by the electrode of the earth to the flow of current into the ground. The mathematical representation of the earth resistance is:
Earth resistance = (Potential of the earth electrode) / (Current)
Earth resistance = (V) / (I)
- V is measured in voltage and is a voltage spike
- I is the current which is injected during the earth resistance
The earth resistance increases with depth and is dependent on the temperature.