Electrical work can be dangerous, so it’s important to know how to check if a wire is live before you start working on it. A live wire is one that has an electrical current running through it, and if you touch it, you could get shocked.
There are a few different ways to check if a wire is live. One way is to use a voltage tester. A voltage tester is a small, handheld device that can detect the presence of an electrical current. To use a voltage tester, simply touch the probes of the tester to the wire. If the tester lights up, then the wire is live.