In a transistor,in common emitter configuration,the ratio of power gain to voltage gain is

In a transistor in $CE$ configuration,the ratio of power gain to voltage gain is

$A$ transistor is operated in common emitter configuration at $V_C = 2 \, V$ such that a change in the base current from $100 \, \mu A$ to $300 \, \mu A$ produces a change in the collector current from $10 \, mA$ to $20 \, mA$. The current gain is

In common emitter mode of a transistor, the d.c. current gain is $20$, and the emitter current is $7 \,mA$. The collector current is (in $/ 3 \,mA$)

In the symbol of a transistor,the arrow indicates the direction of:

In a common base amplifier,the phase difference between the input signal voltage and the output voltage is