Question

Common emitter amplifier has a _______ value of current gain

• A. high
• B. low
• C. moderate
• D. $1$

Answer 1

The correct option is A high

$Answer:-$ A

The current gain for the common emitter amplifier circuit is denoted by the Greek symbol $\beta$. This is the ratio of collector current to base current. This may be thought of as the ratio of output current to input current. To gain an accurate figure of the gain for a signal, the current gain for small input changes in current is often used. Using this the current gain, β, and the changes in input and output current are related in the following way:

$\beta =\frac{\Delta I_c}{I_b}$

Where,
$\beta$ = current gain
$\Delta I_c$ = change in collector current
$\Delta I_b$ = change in base current

Here, for common emitter amplifier current gain has high values.