Electrical Flashcards
7 cards from real NCCER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical flashcards as text
What is the unit of measurement for electrical resistance?
Answer: Ohm
Electrical resistance is measured in ohms, the unit named after physicist Georg Simon Ohm.
According to Ohm's Law, if voltage remains constant and resistance doubles, what happens to current?
Answer: Current is reduced by half
Ohm's Law states I = V/R; when R doubles with constant V, current (I) is reduced by half.
Which type of circuit provides only one path for current to flow through all components?
Answer: Series circuit
In a series circuit, components are connected end-to-end in a single loop, providing only one path for current flow.
What color is the grounding conductor required to be in standard US electrical wiring?
Answer: Green
The NEC requires equipment grounding conductors to be green, green with yellow stripes, or bare copper.
What does GFCI stand for in electrical work?
Answer: Ground Fault Circuit Interrupter
GFCI stands for Ground Fault Circuit Interrupter, a device that detects ground faults and cuts power to prevent electrical shock.
What is the standard nominal voltage for most residential branch circuits in the United States?
Answer: 120 volts
Standard US residential branch circuits operate at 120 volts nominal, which is what you measure at a typical wall outlet.
Which instrument is used to measure electrical current flowing through a circuit?
Answer: Ammeter
An ammeter measures electrical current in amperes and must be connected in series with the circuit being tested.