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?

Power Gain of CE amplifier circuit is given by

In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be:-

Consider four circuits shown in the figure below. In which circuit power dissipated is greatest (Neglect the internal resistance of the power supply)?

Give a circuit diagram of a common emitter amplifier using an n-p-n transistor. Draw the input and output wavefroms of the signal. Write the expression for its voltage gain.

A power transmission line feeds input power at 2300 V a step down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is 90% , the output current would be :

A power transmission line feeds input power at 2300 V a step down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is 90% , the output current would be :

In a common emitter amplifier , the load resistance of the output circuit is 500 times the resistance of the input circuit. If alpha = 0.98 , then find the voltage gain and power gain .

A power circuit uses a cable having three different wires. Name the three wires of the cable.

An npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is 100 Omega and the output load resistance is 10 kOmega .The common emitter current gain beta is :

A npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is 100 Omega and the output load resistance is 10 k Omega . The common emitter current gain beta is: