EIAT and NEIEP Test Electrical Theory 1 — Questions and Answers
Question 1: What is the unit of electrical resistance?
- Ampere
- Volt
- Ohm (Correct answer)
- Watt
Correct answer: Ohm
The ohm (Ω) is the standard unit of electrical resistance in the International System of Units.
Question 2: Ohm's Law states that voltage equals current multiplied by:
- Power
- Resistance (Correct answer)
- Frequency
- Capacitance
Correct answer: Resistance
Ohm's Law is expressed as V = I × R, where V is voltage, I is current, and R is resistance.
Question 3: In a series circuit, the total resistance is equal to:
- The largest resistor value
- The smallest resistor value
- The sum of all resistors (Correct answer)
- The product of all resistors
Correct answer: The sum of all resistors
In a series circuit, resistances add directly: R_total = R1 + R2 + R3 + …
Question 4: Which type of current flows in one direction only?
- Alternating current (AC)
- Direct current (DC) (Correct answer)
- Pulsating current
- Reactive current
Correct answer: Direct current (DC)
Direct current (DC) flows continuously in one direction, unlike AC which reverses direction periodically.
Question 5: What does a capacitor store?
- Magnetic energy
- Electrical charge (Correct answer)
- Current
- Resistance
Correct answer: Electrical charge
A capacitor stores electrical charge (and thus electrical potential energy) in an electric field between its plates.
Question 6: The standard frequency of AC power in the United States is:
- 50 Hz
- 60 Hz (Correct answer)
- 120 Hz
- 400 Hz
Correct answer: 60 Hz
The US electrical grid operates at 60 Hz, meaning the current alternates direction 60 times per second.
EIAT and NEIEP Test Electrical Theory 1
What is the unit of electrical resistance?