Final answer:
A clamp-on ammeter is a type of ammeter that measures current in a circuit by measuring the strength of the magnetic field around a conductor.
Step-by-step explanation:
An ammeter is an instrument used to measure the rate of flow of electric current in a circuit. It must be connected in series with the circuit component being measured. A clamp-on ammeter is a type of ammeter that measures current by measuring the strength of the magnetic field around a conductor. It is called 'clamp-on' because it can be easily attached to a conductor without disconnecting or interrupting the circuit.