Question

Find the equivalent resistance of the network shown in figure (45-E8) between the points A and B.

Answer 1

Let the potential at A and B be $V_A$ and $V_B$ respectively.

(i) If $V_A>V_B$

Then current flows from A to B and the diode is in forward biased.

Equivalent Resistance = $\frac{10}{2}=5\Omega$

(ii) If $V_A<V_B$

The current flows from B to A and the diode is reverse biased.

Hence Equivalent Resistance = $10\Omega$