What is the primary function of CR1 in a full wave rectifier?

The primary function of CR1 in a full wave rectifier is to allow current to pass during the positive half of the input signal cycle. In this configuration, the full wave rectifier utilizes two diodes (like CR1 and another diode), each conducting during alternating halves of the input waveform. When the input voltage is positive, CR1 is forward-biased, allowing current to flow through the load. This is essential for converting AC (alternating current) voltage into DC (direct current) voltage by ensuring that the output voltage always flows in one direction, effectively transforming the entire AC input into a usable DC signal.

During the negative half-cycle, the second diode becomes forward-biased while CR1 is reverse-biased and blocks current. This action creates a full wave that utilizes both halves of the AC cycle, ensuring greater efficiency compared to a half-wave rectifier. The ability of CR1 to conduct during the positive half-cycle plays a critical role in the overall rectification process, which is essential for powering DC devices from an AC supply.