What are the two kinds of resistors?

Resistors are essential components in electronic circuits, and they can be categorized primarily into two types based on their resistance characteristics. Fixed resistors have a specific, unchanged resistance value, making them reliable for consistent performance in circuits. Examples include carbon composition and metal film resistors. On the other hand, variable resistors can adjust their resistance level, allowing them to control the flow of current in a circuit. This category includes potentiometers and rheostats.

Understanding these two types is fundamental for students and technicians as it forms the basis for selecting appropriate resistors for various applications, impacting circuit behavior and functionality. The other options do not accurately classify resistors: for instance, linear and non-linear generally refer to the relationship between voltage and current rather than resistor types, while analog and digital pertain to signal types, and serial and parallel describe circuit configurations rather than characteristics of resistors themselves.