USCG Exam PracticeElectrical troubleshooting and maintenance
When troubleshooting a series circuit with a voltmeter, a technician measures full source voltage across one component while all other components read zero volts. What does this indicate about that component?
- A. The component is shorted and is carrying all circuit current
- ✓ The component is open and is dropping the full source voltageCorrect
- C. The component has excessive resistance causing a voltage rise
- D. The component is operating normally under full load
Why B is correct
NEETS Mod. 1 §3-4 states that an open component in a series path reads the full source voltage across it while the other elements read zero. A shorted component, by contrast, reads zero volts across itself.
Cited:NEETS Mod. 1 §3-4