diode is an active device because it can alter the signal.it respond differently for positive and negative voltages.but a passive elements like resistor responds same for both positive and negative voltage levels, and it can't alter a signal.
I recognize the above as your personal definition. OK?
Or did you find something similar in any textbook?
Seems not understandable anyhow. Please explain in case of a diode...The main property of an active device is that it can radiate energy on its own without any external source of excitation.
Passive device: Passive device is that device which needs external source of excitation,without it it would do nothing except laying passively in the circuit or anywhere. Antenna is a big example of a passive device as it will not radiate anything unless being fed or disturbed by some external source.
Active Device: Active devices are those for which it is not a must to have external source of excitation as they can produce power(roughly) or alter a signal on their own.
How is a transistor different from an antenna in a circuit without any kind of signal of power supply
/SC
A passive component, depending on field, may be either a component that consumes
(but does not produce) energy, or a component that is incapable of power gain.
A component that is not passive is called an active component.
diode is an active device because it can alter the signal.it respond differently for positive and negative voltages.but a passive elements like resistor responds same for both positive and negative voltage levels, and it can't alter a signal.
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so from this point of view diode is also a passive component, because it doesn't need any external resources.
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