FREE NCCER Electrical Theory & Safety Practices Questions and Answers

Question 1

What is Ohm’s Law used to determine in electrical circuits?

Accepted Answer

Voltage drop

Answer

Magnetism

Answer

Capacitance

Answer

Electrical noise

Question 2

Which unit is used to measure electrical resistance?

Accepted Answer

Ohms

Answer

Watts

Answer

Amperes

Answer

Volts

Question 3

What safety gear is essential when working with live electrical circuits?

Accepted Answer

Insulated gloves

Answer

Steel-toe boots

Answer

Hard hat

Answer

Hearing protection

Question 4

Which device automatically interrupts power in case of a fault?

Accepted Answer

Circuit breaker

Answer

Fuse

Answer

Transformer

Answer

Capacitor

Question 5

Which of the following is a common cause of electrical fires?

Accepted Answer

Overloaded circuits

Answer

Grounding

Answer

Circuit labeling

Answer

Insulated conductors

Question 6

What does GFCI stand for?

Accepted Answer

Ground Fault Circuit Interrupter

Answer

Ground Fuse Circuit Indicator

Answer

General Flow Control Interface

Answer

Gauge Frequency Cable Input

Question 7

Which of the following is a conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Glass

Question 8

Why is grounding important in electrical systems?

Accepted Answer

To prevent electrical shock

Answer

To increase voltage

Answer

To prevent corrosion

Answer

To stabilize temperature

Question 9

Which code governs electrical installations in the U.S.?

Accepted Answer

National Electrical Code

Answer

Occupational Safety Code

Answer

Uniform Building Code

Answer

International Fire Code