Calculate the current through the circuit and the potential difference across the diode shown in figure. The drift current for the diode is 20 μA.

Question

Philoid · Accepted Answer

From the given circuit diagram, we can see that the diode is reverse biased.

• Drift current = Diffusion current = 20 μA

∴ Current through the circuit =20 μA

Voltage drop across the 20Ω resistor = 20μA×20Ω

= 4×10^-4 V

Voltage through the circuit= (Voltage from the source)–(Voltage drop across the 20Ω resistor)

=5-0.0004

=4.9996 V ≈5V