Resistor
Resistors are passive two-terminal electrical components that limit the flow of electric current in a circuit. They are widely used in electronics to control the amount of current flowing through a circuit.

Function
- Resistors are used to create specific voltages, currents, or to divide voltages in a circuit.
- They protect components from excessive currents by limiting the flow of electricity.
- They are also used to adjust signal levels, terminate transmission lines, and generate heat in devices like heaters.

Types of Resistors
- There are various types of resistors such as carbon composition, metal film, carbon film, wire wound, and variable resistors.
- The type of resistor used depends on the application and the required resistance value.

Resistance Value
- The resistance value of resistors is measured in ohms (Ω).
- Resistors come in a wide range of resistance values, from fractions of an ohm to several megaohms.

Color Coding
- To identify the resistance value of a resistor, color bands are used.
- Each color represents a digit, and by decoding the color bands, you can determine the resistance value of the resistor.

Symbol
- The symbol for a resistor in circuit diagrams is a zigzag line.

Conclusion
Resistors are essential components in electronics that play a crucial role in controlling the flow of electric current in circuits. They come in various types and resistance values to suit different applications. Understanding how resistors work and their importance in circuits is fundamental in electronics.

A resistor is an electrical component which limits the flow of current.