Question :
In transistor, in ce configuration power is amplified, then how it satisfies law of conservation of energy or power?
ANSWER:
In transistor, in ce configuration power is amplified, then how it satisfies law of conservation of energy or power?
ANSWER:
The transistor can be employed as an amplifying device. That is, the output sinusoidal signal is greater than the input signal or, stated another way, the output ac power is greater than the input ac power. the question then arises as to how the ac power output can be greater than the input ac power?
Conservation of energy dictates that over time the total power output Po cannot be greater than its power input Pi and that the efficiency defined by Po /Pi cannot be greater than 1. The factor missing from the discussion above that permits an ac power output greater than the input ac power is the applied dc power.It is a contributor to the output power even though part of it is dissipated by the device and resistive elements. In other words, there is an exchange of dc power to the ac domain that permits establishing a higher output ac power.
