Which tool is essential for identifying the amperage of a circuit?

A clamp meter is essential for identifying the amperage of a circuit because it is specifically designed to measure the current flowing through a conductor without needing to make direct contact with the electrical components. The clamp meter operates by clamping around a wire and measuring the magnetic field generated by the current. This allows electricians to obtain an accurate reading of the current in amperes, which is critical for assessing the load on the circuit and ensuring that it does not exceed its rated capacity.

Other tools listed, such as a voltage tester, are primarily used for checking the presence of voltage in a circuit rather than directly measuring current. Wire strippers are designed for removing insulation from wires, and insulation resistance testers evaluate the integrity of insulation materials but do not measure current. Thus, while these tools serve important functions in electrical work, none can provide the amperage readings that a clamp meter can.