EIAT Basic Electrical Principles 2 ā Questions and Answers
Question 1: A circuit has a voltage of 120V and a resistance of 40 ohms. What is the power dissipated?
- 360 W (Correct answer)
- 3 W
- 4800 W
- 0.33 W
Correct answer: 360 W
Power = VĀ²/R = 120Ā²/40 = 14400/40 = 360 W.
Question 2: Which type of circuit provides multiple paths for current to flow?
- Series circuit
- Parallel circuit (Correct answer)
- Open circuit
- Short circuit
Correct answer: Parallel circuit
A parallel circuit provides two or more separate paths through which current can flow simultaneously.
Question 3: What happens to total resistance when resistors are added in parallel?
- Total resistance increases
- Total resistance stays the same
- Total resistance decreases (Correct answer)
- Total resistance becomes infinite
Correct answer: Total resistance decreases
Adding resistors in parallel always decreases total resistance because more current paths are available.
Question 4: What is the unit of electrical capacitance?
- Henry
- Farad (Correct answer)
- Ohm
- Siemen
Correct answer: Farad
Capacitance is measured in farads (F), named after Michael Faraday.
Question 5: In an AC circuit, what does 'frequency' describe?
- The peak voltage value
- The number of complete cycles per second (Correct answer)
- The average current over time
- The phase angle between voltage and current
Correct answer: The number of complete cycles per second
Frequency is the number of complete AC cycles occurring per second, measured in hertz (Hz).
Question 6: Two 10-ohm resistors are connected in series. What is the total resistance?
- 5 ohms
- 10 ohms
- 20 ohms (Correct answer)
- 100 ohms
Correct answer: 20 ohms
Series resistors are simply added: 10 + 10 = 20 ohms.
Question 7: What is the standard frequency of AC power supplied in the United States?
- 50 Hz
- 60 Hz (Correct answer)
- 120 Hz
- 400 Hz
Correct answer: 60 Hz
The US standard AC power frequency is 60 Hz, meaning 60 complete cycles per second.
EIAT Basic Electrical Principles 2
A circuit has a voltage of 120V and a resistance of 40 ohms.
What is the power dissipated?