Changing bulbs, Putting Capacitors in Fans and other small jobs like these are very common in homes and tech shops. Almost every man has to face some sort of fixing problems in one way another. The tasks themselves aren't hard, but proper safety should always be our priority. Voltage tester is such a precautionary device. It is very simple and useful. We just need to place in the required region, and it tells us whether that object has circulating current or not by glowing due to the potential difference.

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