What type of resistors exist?

What type of resistors exist?

• A. Ceramic and Metal
• B. High Power and Low Power
• C. Fixed and Variable
• D. Surface Mount and Through-Hole

Answer: (C)

Resistors are categorized by whether their resistance value is fixed or adjustable. Fixed resistors have a single, unchanging resistance value chosen for the circuit, with tolerance and power rating specifying how closely they stick to that value and how much heat they can safely dissipate. Variable resistors, on the other hand, let you change the resistance as needed—this is useful for tuning, calibration, or adjusting a signal. Common variable types are potentiometers (three terminals) and rheostats or small trim pots (adjustable resistors with a knob or screw). The other options don’t capture this fundamental distinction. Materials like ceramic or metal refer to construction, not how the resistance behaves. Power rating (high vs low) describes how much heat the resistor can handle, not whether the resistance can be changed. Packaging styles like surface mount vs through-hole describe how the component is mounted, not its electrical behavior.

Resistors are categorized by whether their resistance value is fixed or adjustable. Fixed resistors have a single, unchanging resistance value chosen for the circuit, with tolerance and power rating specifying how closely they stick to that value and how much heat they can safely dissipate. Variable resistors, on the other hand, let you change the resistance as needed—this is useful for tuning, calibration, or adjusting a signal. Common variable types are potentiometers (three terminals) and rheostats or small trim pots (adjustable resistors with a knob or screw).

The other options don’t capture this fundamental distinction. Materials like ceramic or metal refer to construction, not how the resistance behaves. Power rating (high vs low) describes how much heat the resistor can handle, not whether the resistance can be changed. Packaging styles like surface mount vs through-hole describe how the component is mounted, not its electrical behavior.