What is the Use of RCA Audio Plug in Daily Life?

In the most common daily use of rca audio plugs, there are standard plugs at both ends of the wire, and there is a male terminal in the center, surrounded by a ring, which is sometimes discarded for flexibility. The device is equipped with a socket, and there is a small hole in the center surrounded by a metal inner ring. The diameter of the outer ring of the socket is smaller than that of the plug to allow the plug to be inserted stably. The inner and outer rings of the socket are filled with insulators, usually plastic. Compared with other types of terminals, RCA terminals are used for different purposes, including as power terminals, radio terminals, and speaker wire terminals. Very common as a terminal for composite video, but has poor impedance matching.

RCA terminals and cables are also commonly used to transmit SPDIF digital audio, distinguished by orange plugs, also known as "coaxial cables". The connection method is to push the plug into the socket of the device (commonly known as the female head). The needle for signal transmission protrudes from the plug. Usually, before the ground rings of the two sides (referring to the device and the plug) contact, the needle has contacted the socket, and a buzzing or chirp sound will be heard when the activated sound device is connected. If the plug is halfway out (ground but not signal), there will be a constant noise. In addition, some plugs, especially the cheapest ones, have greatly reduced strength and grounding sheath effectiveness.

RCA plugs are often distinguished by color, yellow is used for composite video, white (or black) is used for left channel in analog stereo signal, and red is used for right channel. "Yellow, white and red" sockets are also installed in almost all audio and video equipment. There should be at least one pair of "yellow, white and red" jacks on the TV for connecting camcorders (via the 3.5 mm mini TRS terminal to three RCA terminals, also known as "mini RCA"), digital cameras and home game consoles. Although almost all audio and video terminals, including audio, composite and component video, and SPDIF digital audio, can use the same resistance value of 75 ohm wire, but some special purpose rca audio plug wire on the market, the resistance value will be higher.

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