Question

Draw the circuit diagram of voltage amplifier using transistor. Explain its working.

Answer 1

actually amplifier is nothing but a devies used to increase the amplitude of the wave. this arrangement commonly use Rb and Rc as potential divider network across the supply. this method reduces the varying β and the powe supply $V_{cc}$ as shown.

now the voltage level across the two resistors holds the base value below supply voltage.now we wil compare the input voltage and output voltage wrt ground. magnification in voltage is amplification of voltage