Physics · Alternating Current

A half-wave rectifier converts an AC signal to DC by passing either the negative or positive half-cycle of the waveform and blocking the other. Half-wave rectifiers can be easily constructed using only one diode, but are less efficient than full-wave rectifiers. During negative half of half wave rectifier, the diode is reverse biased i.e the current of few ohms and hence very high resistance.

A half-wave rectifier converts an AC signal to DC by passing either the negative or positive half-cycle of the waveform and blocking the other. Half-wave rectifiers can be easily constructed using only one diode, but are less efficient than full-wave rectifiers. During negative half of half wave rectifier, the diode is reverse biased i.e the current of few ohms and hence very high resistance.

Incorrect. A diode has low resistance only when it is forward biased, which happens during the positive half-cycle of AC. In the negative half-cycle, the resistance is very high, not low.

Incorrect. A resistance of a few ohms would indicate that the diode allows some current to pass, which does not happen in reverse bias during half-wave rectification.

Incorrect. Resistance cannot be negative in this scenario. The diode’s resistance in reverse bias is high, but still a positive value.