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Classification of power amplifier power amplifier are classified into following group class 'A' power amplifier  class 'B' power amplifier   class 'AB' power amplifier  class 'C' power amplifier      Class 'A' power amplifier   let as consider the following amplifier circuit Here we have n-p-n transistor operated in common emitter mode. Here bias battery V BB   is used in the input circuit to get forward bias in the input circuit during the passes of input signal, here bias battery is stronger then signal, on that case we get faithful amplification. Here collector current is continuous during the passes  of signal OR collector current flows 0 to 360 degree of input signal.    let us consider the following load line analysis with   waveform   For output circuit   V CC =V CE +I C R C  V CE =V CC -  I C R C Note- for power transistor Rc is less therefore collector current Ic will be more this will result into current amplification  Here the interse

How to joint HT cable up to 33KV  On this video we are showing how to cable joint in heat shrink method I hope you will be all enjoy and take information on this video If you are enjoying this video so please subscribe like and share this video and also press the bell icon  

Poly phase or 3-phase Dynamometer type wattmeter  Definition:  Three-Phase Wattmeter is used for measuring the power of the three-phase circuit 3 PHASE DYNAMOMETER TYPE WATTMETER   3 Phase wattmeter  Here we have two element. element one have CC1 and PC1 and element two have CC2 and PC2 both this system are associated with common shaft with common pointer and scale arrangement as shown in fig.  connection diagram as shown in above  Phaser diagram       Calculation   Deflection torque  For Spring control  At steady state condition of pointer  thus pointer indicate is total three phase power