1. Show that the power gain in the above problem is the product of the current gain and the voltage.

1. Show that the power gain in the
above problem is the product of the current gain and the voltage gain.

2. Draw the circuit diagram of an
emitter follower. Why is the circuit called so? Obtain the expressions for
current gain, voltage gain, input impedance and output impedance.

3. Draw the approximate hybrid
model for any transistor configuration at low frequencies. Show that only hie and hfe are important in the model. Is the approximation justified?

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