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Electronic Devices & Circuits PN Junction Diode

A silicon diode with a 0.7 V constant-drop model is connected in series with a 1 kOhm resistor to a 5 V DC source in forward bias. The diode current is approximately?

A0.7 mA
B4.3 mA
C5 mA
D5.7 mA

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Correct Answer: B. 4.3 mA

Explanation: The resistor sees approximately 5 - 0.7 = 4.3 V, so I = 4.3 V / 1 kOhm = 4.3 mA.

Reference: Standard diode circuit calculation

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