Question

Determine the current (in milliamps) flowing in the following circuit if R = 100Ω and if Vb = 3V. Assume the diode has a turn-on voltage Vf = 2V and Rd = 10Ω.

a) 30 mA
b) 60 mA
c) 80 mA
d) 100 mA

Answer 1

The current flowing in the circuit is 30mA.

Step-by-step explanation:

To determine the current flowing in the circuit, we need to consider the turn-on voltage of the diode. The current flowing in the circuit is 30mA. When the turn-on voltage (Vf) is greater than the forward voltage drop across the diode (Vd), the diode conducts current.

In this case, since Vf = 2V and Vd = 0V, the diode is conducting. Therefore, the current flowing through the resistor can be calculated using Ohm's law.

Using Ohm's law, the current (I) can be calculated as: I = V/R

Substituting the given values for Vb = 3V and R = 100Ω, we get: I = 3V / 100Ω = 0.03A = 30mA