What is the primary function of a circuit tester?

The primary function of a circuit tester is to verify the presence or absence of electrical voltage. This tool is essential for electricians and technicians when troubleshooting electrical systems, as it allows them to determine whether the circuit is live or if there may be issues such as a break in the wiring or a blown fuse.

Using a circuit tester, an individual can quickly and safely check outlets, switches, or circuits to ensure they are energized before performing any further work, which helps to prevent electrical accidents. This capability is crucial for maintaining safety standards in electrical work and ensuring that repairs or installations can be done effectively.

While measuring current flow, checking insulation quality, and assessing wire gauge are important aspects of electrical work, they fall outside the primary use of a basic circuit tester, which is specifically designed for voltage detection.