A cathode is a device that emits electrons. When these electrons hit an object, they create a negative charge on the object. This process is called electron emission. Cathodes are used in many devices, including televisions, computers, and fluorescent lights.

The most common type of cathode is the thermionic cathode. This type of cathode uses heat to produce electrons. The hot filament inside the cathode emits electrons when it comes into contact with metal objects such as wires or plates. Thermionic cathodes are found in most electronic devices that use electricity, such as radios and TVs.

There are also photocathodes, which use light to produce electrons instead of heat. Photocathodes are found in some types of solar cells and photoelectric sensors. They can also be used to create images on a screen (such as in a TV).

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