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The devices $$D_1$$ and $$D_2$$ shown (below left) are called diodes and have an interesting property. When current flows in the direction of the arrow the resistance is low and is called forward bias resistance. If the current were to flow in the opposite direction the resistance is high and it is called reverse bias resistance. For $$D_1$$ forward bias resistance is 20 Ohm and reverse bias resistance is 600 Ohm. For $$D_2$$ forward bias resistance is 30 Ohm and reverse bias resistance is 200 Ohm. Find the equivalent resistance between A and B if (i) A is at a higher potential (ii) B is at a higher potential
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Correct Answer: 0
PLACEHOLDER ANSWER - the question has two answers. In the figure $$D_1$$ points from A to B and $$D_2$$ from B to A, and they are in parallel. (i) With A higher, current flows from A to B, so $$D_1$$ is forward (20 ohm) and $$D_2$$ reverse (200 ohm), giving $$\frac{20 \times 200}{220} \approx 18.2\,\Omega$$. (ii) With B higher, $$D_1$$ is reverse (600 ohm) and $$D_2$$ forward (30 ohm), giving $$\frac{600 \times 30}{630} \approx 28.6\,\Omega$$.
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