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Old 9th January, 2002, 06:26 PM
Pinky Pinky is offline
Join Date: September 2001
Posts: 5,957

Originally posted by AidanII
Someone plugs their headphones in.... The headphones have a resistance of 32 Ohms, and the amp still has a resistance of 320 Ohms. That 1v now appears across 352 Ohms of resistance total, allowing a current of 2.8mA to flow. Of that one volt, 0.9V of it disappears across the amplifiers internal resistance, leaving 0.1V to appear across the headphones!

End result: You don't hear much in the headphones, and the amplifier gets warm. Not warm enough to kill it though, as the wattage is too small to generate much heat.

I forgot the math was was working conceptually... not a good idea when playing with numbers

Thanks again, that illustrated it very well for me.
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