ASVAB Electronics Fundamentals and Circuits 2 — Questions and Answers
Question 1: What is the total resistance of two 100Ω resistors connected in parallel?
- 50Ω (Correct answer)
- 200Ω
- 100Ω
- 25Ω
Correct answer: 50Ω
For two equal resistors in parallel: R_total = R ÷ 2 = 100 ÷ 2 = 50Ω. The general formula is 1/R_total = 1/R1 + 1/R2.
Question 2: What does a capacitor do in a circuit?
- Store energy in an electric field (Correct answer)
- Store energy in a magnetic field
- Convert AC to DC
- Amplify signals
Correct answer: Store energy in an electric field
A capacitor stores electrical energy in an electric field between two conducting plates separated by an insulating material (dielectric). It can charge and discharge rapidly.
Question 3: What is the unit of electrical resistance?
- Ohm (Correct answer)
- Ampere
- Volt
- Farad
Correct answer: Ohm
Electrical resistance is measured in ohms (Ω), named after Georg Simon Ohm. One ohm is the resistance that allows one ampere of current to flow when one volt is applied.
Question 4: What is the purpose of a diode?
- Allow current to flow in only one direction (Correct answer)
- Amplify electrical signals
- Store electrical energy
- Measure voltage
Correct answer: Allow current to flow in only one direction
A diode is a semiconductor device that allows current to flow in only one direction (forward bias) and blocks it in the reverse direction. It acts as a one-way valve for electricity.
Question 5: If a 12V battery is connected to a 4Ω resistor, how much current flows?
- 3A (Correct answer)
- 48A
- 0.33A
- 8A
Correct answer: 3A
Using Ohm's Law: I = V ÷ R = 12 ÷ 4 = 3 amperes.
Question 6: What is the function of a transformer?
- Change voltage levels in AC circuits (Correct answer)
- Store energy
- Convert AC to DC
- Generate electricity
Correct answer: Change voltage levels in AC circuits
A transformer uses electromagnetic induction to change (step up or step down) AC voltage levels. It consists of two coils of wire wound around a shared magnetic core.
ASVAB Electronics Fundamentals and Circuits 2
What is the total resistance of two 100Ω resistors connected in parallel?