Consider an amplifier circuit using a transistor.The output power is several times greater than the input power.Where does the extra power come from?

A load resistor of 2 k Omega is connected in the collector branch of an amplifier circuit using a transistor in common-emitter mode. The current gain beta=50 .The input resistance of the transistor is 0.50 k Omega . If the input current is changed by 50 mu A ,(a)by what amount does the output voltage change by ,(b)by what amount does the input voltage change and (c) what is the power gain ?

When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?

Can a transistor amplifier generate power ?

State whether true or false and justify . a Zener diodes are used under forward bias. b. In n-p-n transistor , current conduction is primarily due to electrons . c. Transistor amplifiers do not strictly obey law of conservation of energy since output power is greater than input power . d. In a transistor amplifier all the frequency will have exactly equal gain .

Where does the carbon that is used in photosynthesis come from?

Describe the function of a transistor as an amplifier with the neat circuit diagram.Sketch the input and output wave form.