What is the function of a rectifier?

A rectifier serves a crucial function in electrical systems by converting alternating current (AC) into direct current (DC). This process is essential because many electronic devices, such as computers and battery chargers, require DC for their operation. AC current alternates its direction periodically, while DC maintains a constant direction, making it more suitable for electronic applications.

Rectifiers typically use semiconductor devices like diodes, which allow current to flow in one direction only, effectively blocking the reverse flow that characterizes AC. By doing so, rectifiers ensure that the output current is unidirectional, resulting in a steady DC signal. This capability is fundamental in various applications, including power supplies and signal processing systems, where converting the form of the current is necessary for functionality.

In contrast, options that suggest converting DC to AC, measuring electrical output, or increasing voltage are not functions performed by rectifiers. Instead, these tasks are carried out by devices like inverters (which do the DC to AC conversion), multimeters (for measuring electrical output), and transformers (which can increase or decrease voltage levels). Understanding the specific role of a rectifier is key for anyone working in electrical theory or practical applications.