We can create a full wave rectifier simply by using a centre tapped transformer and two diodes. A centre tapped transformer just has another wire on the secondary side, which is connected to the centre of the transformer coil, allowing us to use the full length of the transformer or just half of it.
Because the current constantly reverses in AC electricity, while in the positive or forward half, the current flows through diode 1 and into the load, then back to the transformer via the centre tapped wire. Diode 2 is blocking the current so it can’t return through here. Only half the transformer coil is therefore used. In the reverse or negative half, the current flows through diode 2, through the load and then back to the transformer. Diode 1 is blocking the current.
The current flows in one direction through the load, so it is considered DC, but it is still pulsating, although there are no gaps. The negative half has been converted into a positive half. The waveform is not smooth,
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