USCG Exam PracticeElectrical measuring devices and instrumentation
A voltmeter is connected in parallel across a load, and an ammeter is connected to measure current through the same load. Which statement correctly describes the physical connection of the ammeter?
- A. The ammeter is connected in parallel with the load, sharing the same two terminals as the voltmeter
- ✓ The ammeter is connected in series in the circuit so all load current passes through itCorrect
- C. The ammeter is connected across the voltage source to measure supply current
- D. The ammeter is connected in parallel with the voltmeter to share the measurement burden
Why B is correct
An ammeter has very low internal resistance and must be placed in series so that the full circuit current flows through it. Connecting it in parallel across a voltage source or load would create a near short-circuit, destroying the instrument.
Cited:NEETS Mod. 3 §1-2