Free AFCT Electronics Information Questions and Answers 1 — Questions and Answers
Question 1: What is the primary function of a capacitor in an electronic circuit?
- To resist the flow of current
- To amplify the electrical signal
- To store electrical energy (Correct answer)
- To convert alternating current to direct current
Correct answer: To store electrical energy
A capacitor stores energy in an electric field between two conductive plates. This ability allows it to smooth out voltage fluctuations, filter signals, and store energy for later release. Resistors resist current, transistors amplify signals, and diodes are used in rectifiers to convert AC to DC.
Question 2: A technician measures a current of 2 amperes (A) flowing through a component with a resistance of 6 ohms (Ω). According to Ohm's Law, what is the voltage across the component?
- 3 V
- 8 V
- 12 V (Correct answer)
- 0.33 V
Correct answer: 12 V
Ohm's Law states that Voltage (V) = Current (I) × Resistance (R). In this scenario, V = 2 A × 6 Ω, which equals 12 V.
Question 3: Which of the following materials is considered the best electrical conductor commonly used in wiring?
- Rubber
- Copper (Correct answer)
- Glass
- Wood
Correct answer: Copper
Copper is an excellent electrical conductor, allowing electricity to flow with very little resistance, which is why it is widely used for electrical wiring. Silver is slightly more conductive but more expensive. Rubber, glass, and wood are electrical insulators.
Question 4: In a simple series circuit, three resistors are connected to a power source. If a fourth resistor is added to this series circuit, what happens to the total resistance?
- It increases. (Correct answer)
- It decreases.
- It stays the same.
- It becomes zero.
Correct answer: It increases.
In a series circuit, the total resistance is the sum of all individual resistances (R_total = R1 + R2 + R3 + ...). Therefore, adding another resistor will always increase the total resistance of the circuit.
Question 5: To correctly measure the voltage drop across a single resistor in a powered circuit, how must a voltmeter be connected?
- In series with the resistor
- With the circuit power turned off
- Touching only one lead of the resistor
- In parallel with the resistor (Correct answer)
Correct answer: In parallel with the resistor
A voltmeter measures the difference in electrical potential between two points. To measure the voltage across a component, the voltmeter's probes must be connected in parallel, with one probe on each side of the component.
Question 6: In a standard American (ANSI) circuit schematic, which of the following components is represented by a zigzag line symbol?
- A capacitor
- A resistor (Correct answer)
- A diode
- A battery
Correct answer: A resistor
The American National Standards Institute (ANSI) standard symbol for a resistor is a zigzag line. The international (IEC) symbol is a rectangle. A capacitor is typically shown as two parallel lines.
Free AFCT Electronics Information Questions and Answers 1
What is the primary function of a capacitor in an electronic circuit?