Question
Physics Question on Sound Wave
How does the dynamic resistance of diode vary with temperature?
A
(A) Directly proportional
B
(B) Inversely proportional
C
(C) Independent
D
(D) Directly to the square of temperature
Answer
(A) Directly proportional
Explanation
Solution
Explanation:
The dynamic resistance of the diode is directly proportional to the temperature.The dynamic resistance can be defined from the I-V characteristic of a diode in forward bias. It is defined as the ratio of a small change to voltage to a small change in current, i.e.rd=(ΔVΔI)=ηVTIVT= Thermal voltageI= Bias currentVT=kTqVT∝TThe dynamic resistance is given by the inverse of the slope of i−v characteristics as shown:
Hence, the correct option is (A).