Question:
If an alternating voltage is applied across a diode in series with a load resistance then
If an alternating voltage is applied across a diode in series with a load resistance then
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A diode conducts only in one half of the AC cycle.
Updated On: Nov 12, 2026
- a d.c. voltage appears across load
- an a.c. voltage appears across load
- a pulsating voltage appears across load
- no voltage appears across load
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
A diode conducts when forward biased and blocks current when reverse biased, so it acts as a half wave rectifier.
Step 2: Positive Half Cycle
The diode is forward biased and current flows through the load resistance.
Step 3: Negative Half Cycle
The diode is reverse biased and no current flows, so the load voltage is zero.
Step 4: Compare the options
The load voltage is one directional but varies between zero and a peak value, so it is pulsating, option (C).
Final Answer:
A pulsating voltage appears across the load. \[ \boxed{\text{(C) }\text{a pulsating voltage appears across load}} \]
A diode conducts when forward biased and blocks current when reverse biased, so it acts as a half wave rectifier.
Step 2: Positive Half Cycle
The diode is forward biased and current flows through the load resistance.
Step 3: Negative Half Cycle
The diode is reverse biased and no current flows, so the load voltage is zero.
Step 4: Compare the options
The load voltage is one directional but varies between zero and a peak value, so it is pulsating, option (C).
Final Answer:
A pulsating voltage appears across the load. \[ \boxed{\text{(C) }\text{a pulsating voltage appears across load}} \]
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