In a half-wave rectifier, the load current flows for 
 

• A half-wave rectifier is a component that only allows one half of the waveform of an AC voltage to transmit, blocking the other half. 
• It only requires one diode to form and is used to convert AC voltage to DC voltage. 
• The output power (DC) to input power ratio of a rectifier is known as its efficiency (AC). It is based on the resistance under load and under a forward biassed situation.

Hence the correct answer is only for every half cycle of the input signal.