What does a circuit tester do?

A circuit tester is a tool used to ensure that electrical circuits are functioning properly. Its primary function includes checking for voltage presence and ensuring continuity, which means it can determine if there is a complete path for current to flow. This is essential for troubleshooting electrical systems, as it allows electricians to verify whether power is reaching a particular point in the circuit and if there are any breaks in the connection.

While measuring resistance in circuits and checking for insulation resistance are important electrical testing tasks, these are typically not the primary functions of a basic circuit tester. A circuit tester is not designed to gauge the temperature of wires, which involves entirely different equipment such as thermal imaging cameras or infrared thermometers. The ability to check voltage and continuity makes the circuit tester a fundamental tool for anyone working with electricity, ensuring safety and functionality in electrical installations and repairs.