Fundamentals of Engineering Basic 3 — Questions and Answers
Question 1: What does Ohm's Law state?
- Voltage equals current multiplied by resistance (Correct answer)
- Current equals voltage multiplied by resistance
- Resistance equals voltage multiplied by current
- Power equals current divided by voltage
Correct answer: Voltage equals current multiplied by resistance
Ohm's Law is V = IR, where V is voltage, I is current, and R is resistance.
Question 2: Three resistors of 2 Ω, 3 Ω, and 5 Ω are connected in series. What is the total resistance?
- 10 Ω (Correct answer)
- 0.97 Ω
- 5 Ω
- 30 Ω
Correct answer: 10 Ω
Series resistances add directly: 2 + 3 + 5 = 10 Ω.
Question 3: Which material is classified as a semiconductor?
- Silicon (Correct answer)
- Copper
- Glass
- Aluminum
Correct answer: Silicon
Silicon is the most widely used semiconductor, having conductivity between conductors and insulators.
Question 4: What is the power consumed by a device drawing 2 A at 120 V?
- 240 W (Correct answer)
- 60 W
- 122 W
- 480 W
Correct answer: 240 W
Power P = IV = 2 A × 120 V = 240 W.
Question 5: In a parallel circuit, the voltage across each branch is:
- Equal to the source voltage (Correct answer)
- Divided equally among branches
- Proportional to each branch's resistance
- Zero
Correct answer: Equal to the source voltage
In a parallel circuit, all branches share the same voltage as the source.
Question 6: Which of the following converts electrical energy into mechanical energy?
- Electric motor (Correct answer)
- Generator
- Transformer
- Capacitor
Correct answer: Electric motor
An electric motor converts electrical energy into rotational (mechanical) energy.
Question 7: What does a capacitor store?
- Electrical energy in an electric field (Correct answer)
- Magnetic energy in a magnetic field
- Chemical energy
- Thermal energy
Correct answer: Electrical energy in an electric field
A capacitor stores electrical energy by accumulating charge on two conductive plates separated by an insulator.
Fundamentals of Engineering Basic 3
What does Ohm's Law state?