Response to the following problem:
A diode operates in a series circuit with a resistance R and a dc source V. A designer, considering using a constant-voltage model, is uncertain whether to use 0.7 V or 0.6 V for VD. For what value of V is the difference in the calculated values of current only 1%? For V = 3 V and R = 1 kΩ, what two current estimates would result from the use of the two values of VD? What is their percentage difference?