13:45 Aug 9, 2011 

Hy Mediamatrix. I'd like to award you the points for this answer, as bias was a fitting solution for my problem. You should enter a formal answer, as discussion entries cannot be awarded points

13:15 Aug 8, 2011 

There are two voltages applied to the base - the bias voltage, which is fixed, and sets the optimum operating conditions for the transistor, and the signal voltage (analogue waveform or pulses) which is impressed upon the fixed bias voltage and appears at the collector or emitter of the transistor with modified characteristics (waveform, amplitude or impedance, all depending on how the transistor is biassed and which is being used as the output terminal).
It is not possible to determine, from the question as given, precisely which aspect of this is being referred to.

08:14 Aug 8, 2011 

Sorry, see previous answer. I can add it's a bipolar junction transistor, not a FET. I was also thinking about biasing. If I understand correct, everytime the current is applied to the base terminal in order to change the behaviour of the current through emittor and collector, this is "biasing". Am I wrong?

00:17 Aug 8, 2011 

'potare' could be either 'bias' or 'drive' (or maybe something else...), depending on how it is used in the source text.