In the most common daily use of rca audio plugs, there are standard plugs on both ends of the wire. There is a male connector at the center, surrounded by a ring. This ring is sometimes abandoned due to flexibility. The device is equipped with a socket, 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 an insulator, usually filled with plastic. Compared with other types of terminals, the RCA terminal uses a purpose different from the original one, including as a power terminal, a radio terminal, and a speaker wire terminal. Very common as a terminal for composite video, but the impedance matching performance is poor.
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 above the plug. Usually, before the grounding ring of both parties (referring to the device and the plug) touches, the needle is in contact with the socket, and a buzzing or chirping sound will be heard when connecting the activated sound device. If the plug falls out halfway (the ground is broken but the signal is not broken), a continuous noise will be emitted. In addition, some plugs, especially the cheapest ones, will greatly reduce the tightness and effectiveness of the grounding sheath. RCA plugs are often distinguished by color, yellow is used for composite video, white (or black) is used as the left channel, and red is used as the right channel in analog stereo audio. "Yellow White Red" jacks are installed in almost all audio-visual equipment. There is at least one pair of "yellow white red" sockets on the TV to connect the camcorder (through 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 be used with 75 ohm wires, there are some special-purpose rca audio plug wires on the market that have higher resistance.
