Covenanter said:
I was using "active" in the sense that they change their characteristics when a voltage is applied. Resistors, inductors etc don't do that in any material way. That might not be the textbook definition but it is what I meant.
Chris
PS I get my knowledge from my first degreee which was in electronics.
Using knowledge from my first degree and Google:
[*]
Active components rely on a source of energy (usually from the DC circuit, which we have chosen to ignore) and usually can inject power into a circuit, though this is not part of the definition.[1]. Active components include amplifying components such as transistors, triode vacuum tubes (valves), and tunnel diodes.[*]
Passive components can't introduce net energy into the circuit. They also can't rely on a source of power, except for what is available from the (AC) circuit they are connected to. As a consequence they can't amplify (increase the power of a signal), although they may increase a voltage or current (such as is done by a transformer or resonant circuit). Passive components include two-terminal components such as resistors, capacitors, inductors, and transformers.