A lucency just means a dark area on the x-ray/CT as opposed to an opacity (which is a white area). I'm not sure what type of CT scan you got (i.e. with or without contrast injection), but don't jump to conclusions about it being cancer..... lucency just means a dark area on the x-ray/CT as opposed to an opacity (which is a white area). I'm not sure what type of CT scan you got (i.e. with or without contrast injection), but don't jump to conclusions about it being cancer.....
The operational details of amplifiers are buried in the field of electronics, but for audio purposes it is usually safe to say that current commercial audio amplifiers are so good that a normally operating amplifier is seldom the limitation on the fidelity of a sound reproduction system.
This is the way signals are amplified by trasisters. So it's the voltage/power source that supplies the electrons. It's not that a transistor creates more current, but that it controls HOW MUCH current is drawn from the source. As an amplifier, a transistor just increases the amplitude of the input signal. The power from the voltage source described above is used to amplify the signal. Conclusion: You're not getting something for nothing, but using the voltage from a power source in a clever way to change an input signal.