NCCER Electrical

Question 1

What is the unit of measurement for electrical resistance?

Accepted Answer

Ohm

Answer

Electrical resistance is measured in ohms, the unit named after physicist Georg Simon Ohm.

Question 2

According to Ohm's Law, if voltage remains constant and resistance doubles, what happens to current?

Accepted Answer

Current is reduced by half

Answer

Ohm's Law states I = V/R; when R doubles with constant V, current (I) is reduced by half.

Question 3

Which type of circuit provides only one path for current to flow through all components?

Accepted Answer

Series circuit

Answer

In a series circuit, components are connected end-to-end in a single loop, providing only one path for current flow.

Question 4

What color is the grounding conductor required to be in standard US electrical wiring?

Accepted Answer

Green

Answer

The NEC requires equipment grounding conductors to be green, green with yellow stripes, or bare copper.

Question 5

What does GFCI stand for in electrical work?

Accepted Answer

Ground Fault Circuit Interrupter

Answer

GFCI stands for Ground Fault Circuit Interrupter, a device that detects ground faults and cuts power to prevent electrical shock.

NCCER (National Center for Construction Education & Research) Practice Test