A forward biased silicon diode is in series with a 12PPP resistor. The source voltage is 5 V . The voltage across the diode is_______ and the voltage across the resistor is________
A) 0.7 V, 4.3 V
B) 0.3 V, 4.7 V
C) 4.7 V, 0.3 V
D) 4.3 V, 0.7 V

Question

A forward biased silicon diode is in series with a  12PPP  resistor. The source voltage is  5 V . The voltage across the diode is_______ and the voltage across the resistor is________
A)  0.7 V, 4.3 V 
B)  0.3 V, 4.7 V
C)  4.7 V, 0.3 V
D)  4.3 V, 0.7 V

Quizplus · Accepted Answer

In a forward biased silicon diode, the voltage drop across it is approximately 0.7 V. Therefore, the voltage across the diode is 0.7 V.
Using Kirchhoff's Voltage Law (KVL), the sum of all voltages in a series circuit is equal to the source voltage. Therefore, the voltage across the resistor can be found by subtracting the voltage across the diode from the source voltage: 
Voltage across resistor = Source voltage - Voltage across diode 
Voltage across resistor = 5 V - 0.7 V = 4.3 V. Therefore, the voltage across the resistor is 4.3 V.

A Forward Biased Silicon Diode Is in Series with a