Which symbol represents a resistor in electrical schematics?

The symbol for a resistor in electrical schematics is represented by a zigzag line. This particular representation is widely recognized in circuit diagrams, indicating the component's function of resisting the flow of electric current. Resistors play a crucial role in circuits by controlling current levels, dividing voltages, or dissipating power as heat. The zigzag shape effectively denotes this characteristic, distinguishing it from symbols for other electrical components.

In contrast, the other symbols serve different functions: a straight line typically represents a wire or a conductor, a circle may indicate a connection point or a node, and a rectangle can symbolize other components like capacitors or transformers, depending on the specific schematic conventions used. Understanding these symbols is essential for effectively reading and interpreting electrical schematics.