Free AFCT Electronics: Components and Functions Questions and Answers 1 — Questions and Answers
Question 1: Which electronic component is designed to store energy in an electric field?
- Resistor
- Inductor
- Diode
- Capacitor (Correct answer)
Correct answer: Capacitor
A capacitor is a passive electronic component that stores electrical energy in an electrostatic field between two conductive plates separated by an insulator. This ability to store charge allows it to block DC current while allowing AC current to pass, among other functions.
Question 2: What is the primary function of a transistor?
- To resist the flow of current
- To amplify or switch electronic signals (Correct answer)
- To convert AC to DC
- To store energy in a magnetic field
Correct answer: To amplify or switch electronic signals
A transistor is a semiconductor device that is a fundamental building block of modern electronics. It can be used to either amplify a weak electronic signal or to act as a fast-acting switch, turning a current on or off.
Question 3: A diode is a component that primarily...
- allows current to flow in only one direction. (Correct answer)
- stores an electrical charge.
- increases the strength of a signal.
- resists the flow of current equally in both directions.
Correct answer: allows current to flow in only one direction.
A diode is a semiconductor device that allows electrical current to flow in only one direction. It has very low resistance to current in one direction (forward bias) and very high resistance in the other (reverse bias), effectively acting as a one-way valve for electricity.
Question 4: Which component stores energy in a magnetic field when current passes through it?
- Capacitor
- Resistor
- Inductor (Correct answer)
- Transistor
Correct answer: Inductor
An inductor is a passive component, typically a coil of wire, that stores energy in a magnetic field created by the electric current flowing through it. Its primary property is to oppose any change in the current flowing through it.
Question 5: What is the unit of measurement for electrical resistance?
- Volt
- Ampere
- Watt
- Ohm (Correct answer)
Correct answer: Ohm
The Ohm, symbolized by the Greek letter omega (Ω), is the SI unit of electrical resistance. It is named after Georg Simon Ohm, who formulated Ohm's Law. Resistance measures the opposition to the flow of electric current.
Question 6: What is the function of a transformer?
- To convert chemical energy to electrical energy
- To increase or decrease AC voltage (Correct answer)
- To rectify AC into DC
- To regulate current flow in a DC circuit
Correct answer: To increase or decrease AC voltage
A transformer is a device used to transfer electrical energy between two or more circuits through electromagnetic induction. It is most commonly used to increase ('step-up') or decrease ('step-down') AC voltages, which is crucial for efficient power transmission.
Free AFCT Electronics: Components and Functions Questions and Answers 1
Which electronic component is designed to store energy in an electric field?