March 20, 2014

FCC Technician Exam Question Of The Day (T7D03)

Q) How is an ammeter usually connected to a circuit?

A) In series with the circuit

NJ2X Notes:
An ammeter is an test instrument used to measure the current flowing through a circuit.  An ammeter is always placed in series when measuring the current.  An ammeter has a low impedance (resistance) so that there is a negligible voltage across it.  Thus the ammeter does not disturb or materially become part of the circuit.