Discussion
Why does a bridge rectifier need no centre-tapped transformer?
Answer: C
The four diodes steer whichever end of the winding is positive to the load, so a single winding serves both half cycles. The diodes conduct in pairs but carry the full load current, not half. The doubled ripple frequency and the lower voltage rating are both real advantages but neither explains the absence of a centre tap. A switching arrangement that can reverse a connection removes the need for a second source, which is the same idea as an H-bridge in a motor drive.
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