What is the standard electrical symbol for a rectifier?

The standard electrical symbol for a rectifier is represented by a triangle that points in the direction of current flow. This symbol effectively conveys the function of a rectifier, which converts alternating current (AC) to direct current (DC). The triangular shape illustrates the unidirectional flow of electricity, emphasizing how a rectifier allows current to pass in only one direction while blocking it in the reverse direction.

This design aligns with the principles of electronic components and circuit symbols, where the directionality of symbols often signifies their operational function. A triangle pointing in the flow direction provides clear visual guidance on the component's behavior in a circuit, making it easily identifiable to those working with electronic schematics.

In contrast, other symbols do not accurately represent the function of a rectifier. For example, a circle with a line does not effectively demonstrate the rectification process, a square box does not convey directionality, and a zigzag line is typically used to symbolize resistors, which serve entirely different purposes in a circuit. Therefore, the triangle symbol is appropriate and universally recognized in electrical schematics for indicating rectifiers.