Find I and V in the given circuit assuming ideal diode.

Concept:

• An ideal diode acts as a short circuit when forward bias, i.e. the diode can be replaced with a shorted terminal.
• Also, the diode acts as an open circuit when reverse biased, i.e. the diode can be replaced with an open circuit.

Calculation:

For the given circuit, the p-terminal of the diode is at -5 V potential and the n-terminal is at 0 V (grounded).

∴ The diode is clearly reversed bias. Replacing it with open circuit, the circuit is redrawn as:

So I = 0mA

Applying KVL from ground to -5 V, we get:

0 - V + 5 = 0

V = 5 V