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Passive Components

Active Components
These components are parts of a circuit that rely on an external power source to control or modify electrical signals. Active components such as transistors and silicon-controlled rectifiers (SCRs) use electricity to control electricity.
Passive Components

Components like resistors, transformers, and diodes don’t need an external power source to function. These components use some other property to control the electrical signal. They only require the current traveling through the connected circuit. For example, resistors impede the flow of electrons without introducing more electricity into the system.

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