Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
An ideal diode is one which behaves as a perfect ____ when forward biased.
Conductor
Insulator
Resistance material
None of the above
Conductor
Quick Summary: An ideal diode is a theoretical component that offers zero resistance to current flow when forward biased and infinite resistance when reverse biased. In the forward-biased state, it acts as a closed switch or a perfect conductor, meaning there is no voltage drop across it.
An ideal diode is a theoretical component that offers zero resistance to current flow when forward biased and infinite resistance when reverse biased. In the forward-biased state, it acts as a closed switch or a perfect conductor, meaning there is no voltage drop across it.
VD=0 — Voltage across an ideal diode in forward bias
Rf=0 — Forward resistance of an ideal diode
When forward biased, the potential difference across the anode and cathode makes the diode enter its conducting state. Since an ideal diode has no threshold voltage (cut-in voltage is 0V) and no internal depletion resistance, the forward current IF flows unimpeded, resulting in a perfect short-circuit equivalent.
Ideal diodes have zero threshold voltage (Vγ=0).
Forward resistance is zero, implying no power loss (P=I2R=0).
They act as a unidirectional switch.
Reverse biased, they act as an open circuit (R=∞).
No power dissipation
Instantaneous switching
Perfect rectification
Does not exist in real-world scenarios
Ignores parasitic capacitance and reverse recovery time
Theoretical circuit analysis
Simplifying complex power electronic models
Real silicon diodes have a cut-in voltage of approximately 0.7V.
Option B (Insulator) describes the state of the diode when it is reverse biased.
A is correct — An ideal diode acts as a perfect conductor (short circuit) in forward bias, allowing current to pass with zero voltage drop.
Always verify if the question asks for an 'ideal' or 'practical' diode; practical diodes always account for a voltage drop (e.g., 0.7V for Si) and dynamic resistance (rd).