What is a test light used for?

A test light is primarily utilized to check for the presence of voltage in a circuit. It serves as a simple and effective tool that provides a visual indication, typically through a light that illuminates when voltage is detected. This function is essential for electricians and technicians as it helps in confirming whether a circuit is live or de-energized before carrying out repairs or maintenance.

Understanding the role of a test light is fundamental in electrical work because knowing whether voltage is present helps ensure the safety of the technician and proper troubleshooting of electrical circuits. This makes the use of a test light a critical step in any electrical diagnostic process.