IBEW IBEW Aptitude Test Electrical Fundamentals Questions and Answers 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 SI unit of electrical resistance, named after Georg Simon Ohm.
Question 2: Ohm's Law states that voltage (V) equals:
- Current × Resistance (Correct answer)
- Current ÷ Resistance
- Power × Time
- Resistance ÷ Current
Correct answer: Current × Resistance
Ohm's Law is V = I × R, where V is voltage, I is current in amperes, and R is resistance in ohms.
Question 3: In a series circuit with resistors of 10Ω and 20Ω, what is the total resistance?
- 10Ω
- 6.67Ω
- 30Ω (Correct answer)
- 200Ω
Correct answer: 30Ω
In a series circuit, resistances add directly: 10Ω + 20Ω = 30Ω.
Question 4: What is the unit of electrical current?
- Volt
- Ohm
- Watt
- Ampere (Correct answer)
Correct answer: Ampere
The ampere (A) is the SI base unit for measuring the flow of electric current.
Question 5: Which material is the best conductor of electricity among these options?
- Rubber
- Plastic
- Copper (Correct answer)
- Wood
Correct answer: Copper
Copper has very low electrical resistance and is the most commonly used conductor in electrical wiring.
Question 6: What device is used to measure voltage in an electrical circuit?
- Ammeter
- Wattmeter
- Voltmeter (Correct answer)
- Ohmmeter
Correct answer: Voltmeter
A voltmeter measures the potential difference (voltage) between two points in a circuit and is connected in parallel.
IBEW IBEW Aptitude Test Electrical Fundamentals Questions and Answers 1
What is the unit of electrical resistance?