Which method is used for full wave rectification of alternating current?

The method involving the use of four diodes is the correct choice for full wave rectification of alternating current. This is commonly achieved through a configuration known as a bridge rectifier. In a full wave rectification process, the goal is to convert both halves of the alternating current (AC) waveform into a direct current (DC) output.

In the bridge rectifier configuration, the four diodes are arranged in such a way that during the positive half of the AC waveform, two of the diodes conduct and allow current to pass through to the load, while the other two diodes remain off. During the negative half of the AC waveform, the other two diodes become conductive and channel current to the load in the same direction as during the positive half. This ensures a continuous flow of current, effectively doubling the output frequency compared to half-wave rectification methods.

Using a single diode only allows for half-wave rectification, where only one half of the AC waveform is utilized, leading to pulsating DC rather than a smoother, more consistent direct current. A transformer does not rectify AC; it is used for voltage transformation. A resistor simply provides resistance; it does not rectify AC current. Thus, the use of four diodes is essential in