Which two measurements are essential for testing insulation resistance?

The chosen answer emphasizes the significance of understanding the relationship between leakage current and the resistance of insulation when assessing insulation resistance. Insulation resistance testing is primarily aimed at evaluating how well insulating materials prevent electrical current from leaking.

By determining the actual leakage current and relating it to the resistance of the insulation, one can effectively measure how effective the insulation is at preventing current from passing through it. If the resistance is low, it may indicate a potential failure or degradation of the insulation, suggesting a risk for electrical faults.

This understanding is crucial in various applications, particularly in electrical systems where proper insulation is vital to safety and performance. It helps in diagnosing insulation quality and long-term reliability.