If a digital multimeter is set up 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"? EL-0211

Correct Answer: Option B — the diode is functioning properly

A functioning silicon semiconductor diode exhibits low forward resistance (few ohms) and high reverse resistance (hundreds of ohms to megaohms). Readings of 4.7 ohms forward and 490 ohms reverse verify proper asymmetrical conduction without short or open failure modes.