For classic composite A/V, the yellow RCA plug carries the video signal. The red and white plugs carry right and left audio. With component video, the three video signals use green (Y), blue (Pb/Cb), and red (Pr/Cr). If your device outputs separate audio, connect the red/white audio RCAs as well.

• Match colors on both ends and select the TV’s AV or Component input.
• Video cables are typically 75‑ohm, which can help maintain picture quality.
• For 3.5mm-to-RCA A/V leads, pinouts can vary by device, so checking the device manual is a good idea.

They look similar, but they’re built for different signals.

• Impedance: Video RCA cables are typically 75‑ohm for analog video. Many audio RCAs aren’t specified for 75‑ohm.
• Color coding: Yellow = composite video; red/white (or red/black) = stereo audio. Component video uses green/blue/red for video, with optional red/white for audio.
• Shielding: Video cables often include shielding optimized for higher‑frequency video signals.
• Interchangeability: An audio RCA may pass video in a pinch, but quality can vary. A 75‑ohm video cable usually works fine for audio.

Using the type your device calls for can help preserve expected performance.

Here are common RCA cable types and where they’re used:

• Composite A/V (yellow + red/white): One video channel plus stereo audio for DVD players, VCRs, and retro consoles.
• Component video (green/blue/red): Split video signals for higher resolutions; add red/white RCAs for audio if needed.
• 2‑RCA stereo audio: Red/white pair for left/right audio between players and receivers.
• Mono/subwoofer (single RCA): One‑channel audio runs.
• Extensions and couplers: Male‑to‑female cables or adapters to add length.
• 3.5mm‑to‑RCA A/V: Connects camcorders or portable devices to TVs; pinouts vary by device.
• Camera/backup extensions: Long RCA runs with a trigger/detection wire for reversing lights.
• HDMI‑to‑RCA adapters: One‑way conversion options that may require an active converter.

Match the cable to your ports and signal type for best results.

They do, especially with older and specialty gear.

• Legacy video: VCRs, DVD players, older camcorders, and many retro game consoles rely on composite or component RCA.
• Home audio: Stereo receivers, powered speakers, and some subwoofers commonly use RCA connectors.
• Backup cameras: Many aftermarket systems run video over RCA with a detection/trigger wire.
• Projectors and certain TVs: Some models still include composite/component inputs.

Many newer TVs have fewer analog inputs, so an adapter or converter can be helpful. If you’re integrating older devices, RCA cables remain a practical, familiar option.

Here’s a simple path that can help:

1. Check ports: Look for composite (yellow/red/white) or component (green/blue/red) inputs on your TV.
2. Direct connect: If available, match colors end‑to‑end, then select the TV’s AV/Component input.
3. HDMI‑only TV? Use a composite‑to‑HDMI or component‑to‑HDMI converter. Passive “cables” alone typically don’t convert signals.
4. Power and direction: Many converters need USB or wall power and are one‑way; follow the labeled input/output.
5. Fine‑tune: Set the source’s video standard/resolution and adjust the TV’s aspect ratio as needed.
6. Cable care: Keep runs reasonable and avoid tight bends to help reduce noise.

This approach can bring retro devices onto modern screens with minimal fuss.