An electric tester is a device that detects the presence of voltage in a wire or an outlet.
It works by sensing a small amount of current that is capacitively coupled from the live circuit to the tester and back to ground.
The tester has a neon lamp that glows when it receives enough voltage, usually around 80 volt.an electric tester does not work on DC current because capacitors and transformers, which are used to couple the current, do not work with DC.
DC current has a constant polarity and does not change direction like AC current. Therefore, the tester cannot detect any voltage difference between the live wire and the ground.
If you want to test a DC circuit, you will need a different device, such as a multimeter, that can measure the actual voltage level on the wire. A multimeter can also measure other electrical properties, such as resistance and current.
However, you should be careful when using a multimeter on a live circuit, as it may cause a short circuit or damage the device if you use the wrong settings or probes.
Always read and follow the instructions and warnings that come with your multimeter before using it.
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