Rca Composite Cables Views
As with many other connectors, the RCA has been adopted for other uses than originally intended, including as a power connector, an RF connector, and as a connector for loudspeaker cables. Its use as a connector for composite video signals is extremely common, but provides poor impedance matching. RCA connectors and cable are also commonly used to carry S/PDIF-formatted digital audio, with plugs colored orange to differentiate them from other typical connections.
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While you certainly could get a VGA to composite video adapter, to connect your PC to HDTV, I'm not really certain why you'd want to. Most computer video cards support HD video resolutions like 1280x720 and 1920x1080 using either component connections (the red, blue, and green RCA cables), HDMI, DVI, or VGA. At best the yellow RCA connection you make on the composite video-in will be 480p or 640x480, which is the equivalent of many cell phone screen resolutions. There are probably several better choices for your connection instead.
Cables To Go 29109 Velocity RCA Composite Audio/Video Cable Velocity