A silicon diode requires a minimum current of 1 mA to be above the knee voltage (0.7 V) of its I-V characteristic curve. When it is connected in series with a resistance R across a voltage source V, the voltage across the diode is 0.7 V when the current through the circuit is 1 mA. The value of R is
Q1. A silicon diode requires a minimum current of 1 mA to be above the knee voltage (0.7 V) of its I-V characteristic curve. When it is connected in series with a resistance R across a voltage source V, the voltage across the diode is 0.7 V when the current through the circuit is 1 mA. The value of R is
Answer: 3 kΩ
Explanation: Using Ohm's law, R = (V - 0.7) / I = (V - 0.7) / 1 mA = 3 kΩ for V = 4 V.