Active and Passive component

ACTIVE components increase the power of a signal and must be supplied with the signal and a source of power.Examples are bipolar transistors, field effect transistors etc. The signal is fed into one connection of the active device and the amplified version taken from another connection. In a transistor, the signal can be applied to the base connection and the amplified version taken from the collector. The source of power is usually a dc voltage from a battery or power supply. PASSIVE components do not increase the power of a signal. They often cause power to be lost. Some can increase the voltage at the expense of current, so overall there is a loss of power. Resistors, capacitors, inductors and diodes are examples of passive components. Integrated circuits contain both active and passive components. Since they usually increase the power of a signal and require a source of dc power they are treated as active devices.