If a digital multimeter is setup as shown in...

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Question 1 of 2066636eed28f7522a1c51d4b4

If a digital multimeter is setup as shown in figures "A" and "B" of the illustration, what is the status of the silicon diode if the display reads 4.7 ohms when configured as in figure "A" and reads 490 ohms when configured as in figure "B"? Illustration EL-0211

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Question 1 of 20

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🔍 Key Concepts

• Silicon diode behavior in forward bias vs reverse bias • How a digital multimeter ohms setting applies a small DC voltage and measures current to show resistance • What readings you expect for a shorted diode vs an open diode vs a normal diode when measuring in both directions

💭 Think About

• Compare the reading in figure A to what you would expect when a diode is forward-biased. Is a few ohms, a few hundred ohms, or very high resistance more typical for a healthy silicon diode? • Compare the reading in figure B to what you would expect when a diode is reverse-biased. Should you see conduction, very high resistance, or something in between? • Think about which diode fault would let current pass easily in both directions, and which fault would block current in both directions. How do the two measured values fit into those patterns?

✅ Before You Answer

• Identify which lead (red or black) is on the cathode stripe in each figure, so you know which setup is forward- and which is reverse-bias. • Decide whether each reading (4.7 Ω and 490 Ω) indicates very low, moderate, or very high resistance for a diode test. • Match the pattern of those two resistances (one direction vs the other) to one of the three conditions: shorted, open, or functioning normally.

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