Temperature Diode Circuit

If you have a series circuit........with a dc power supply...?

If you have a series circuit consisting of a dc power supply, a 90 ohm resistor and a diode.
If the measured current in the circuit is 21 mA, and the saturation current for the diode is 0.010 mA, what is the voltage drop across the diode? (We are supposed to assume the diode temperature is 300 K.)

You are supposed to solve this using the Shockley diode equation

I = Is exp(V / Vt),
Is = saturation current
Vt = k T / q
k = Boltzmann's constant, 1.38E-23 J/K
q = electron charge, 1.602E-19 C
Since you know I (=21E-3 A) you will need to invert the equation and solve it for V.

I/Is = 2100; Ln(2100) = 7.65 = V/Vt; Vt = .0258, so V = .198, basically 0.2 V.

This suggests that you don't have a regular silicon diode, but some other type. (Shottky?)

The value of the resistor and the supply voltage are not needed; once you know the diode's current, temperature and saturation current, you can calculate its forward voltage.

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