GATE EC 2025 Set 1 — Question 57
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Analog Circuits → Diode Circuits → HW, FW & Bridge Rectifiers
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Question
All the diodes in the circuit given below are ideal. Which of the following plots is/are correct when (in Volts) is swept from to ?
Correct answer
(A) [figure]; (D) [figure]
Solution
The circuit is a standard bridge rectifier with a resistive load .
1.Output Voltage (): For ideal diodes, the output voltage is the absolute value of the input voltage, . This is because in both half-cycles, the current flows through the resistor in the same direction. Plot (A) correctly shows this V-shaped transfer characteristic.
2.Input Current (): The bridge rectifier with a resistive load presents a constant resistance to the source in both half-cycles. Therefore, the input current is . This is a linear relationship represented by a straight line passing through the origin. Plot (D) correctly shows this relationship.
Plot (C) is incorrect because it suggests , which would mean the source current never reverses, which is physically impossible for this circuit.Continue learning with Success Tracker
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