Electronics & Software – Tips & Guide


Is capacitor an active or passive device

Is capacitor an active or passive device?

Energy consuming devices would be classified in passive devices. The capacitor consumes only energy, so it is a passive device.

  • it is a passive device.
  • An active device provides power to a network.
  • A capacitor consumes the energy of the source, across its impedance. therefore passive.

For a circuit to be correctly called electronic, it must contain at least one active device. components incapable of controlling the current by means of another electrical signal are called passive devices. Resistors, capacitors, inductors, transformers and even diodes are all considered passive devices.

it’s a passive device for sure because active devices need to generate power | and each circuit needs an active source but the capacitor does not produce energy .. it can regulate it by maintaining it and releasing it after a certain time | | but there is a lot of difference between regulating and generating energy.

it’s a passive device. it does not need external power to present the property – the capacity. the capacity of the device is fixed at the time of its manufacture and is a constant property decided by the physical structure and the material used in the manufacture.

but consider a bjt, it is an active device. the current gain value characterizing the device depends largely on the operating conditions – polarization and configuration ckt. intact we have two different common transmitter current gains, b_dc and b_ac (small signal). b also depends a bit on the temperature. therefore, bjt is an active device.

Any device capable of controlling the flow of current in a circuit (or, equivalently, the flow of electrons through them) via another electrical signal is called an active device. alternatively, devices that are incapable of influencing the current are called passive devices.

the important bit in the above definition is “via another electrical signal”. for example, transistors such as the control current through an applied voltage (hence called a voltage control device) are therefore active devices.

On the other hand, a diode may also appear to be an active device because it has an inherent breaking voltage and a breakdown voltage. However, since these voltage values can not be controlled externally, they are considered passive devices.

A capacitor can store electrical energy and serve as a ground for alternating current, but it can not be used to control the flow of current. it is therefore a passive device.