Insulation resistance refers to the ability of an insulating material to resist the flow of electric current. It is a crucial property in electrical systems, ensuring that electricity flows through intended paths, such as wires, while preventing leakage to other surfaces. High insulation resistance indicates good insulation quality, which helps protect equipment and personnel from electrical shocks. Measuring insulation resistance is typically done using a device called an insulation resistance tester. This measurement is expressed in ohms, and higher values signify better insulation performance. Regular testing helps identify potential issues, ensuring safety and reliability in electrical installations and equipment.