Tester

A tester is an instrument used to check whether electricity is flowing through a substance or not. It is also known as a circuit tester or electrical tester.

Working of a Tester

A tester works by completing an electrical circuit through the substance being tested. It has two probes, which are used to touch the substance. If electricity is flowing through the substance, the tester will light up or make a sound to indicate that the circuit is complete.

Types of Testers

There are different types of testers available, such as:

1. Non-contact voltage testers: They are used to detect the presence of voltage without making contact with the substance.

2. Digital multimeters: They are used to measure voltage, current, and resistance.

3. Continuity testers: They are used to check whether a circuit is complete or not.

4. Analog multimeters: They are used to measure voltage, current, and resistance, but they are less accurate than digital multimeters.

Precautions while using a Tester

While using a tester, one should take the following precautions:

1. Always make sure that the circuit is turned off before using the tester.

2. Make sure that the substance being tested is not wet or damp, as it can cause a short circuit.

3. Always use insulated gloves while handling electrical equipment.

4. Read the instructions carefully before using the tester.

In conclusion, a tester is an important instrument used to check whether electricity is flowing through a substance or not. It is important to take necessary precautions while using a tester to avoid electrical accidents.