When you turn the AC on, turn the speakers louder or turn on a subwoofer in a car, does fuel economy decrease in order to create more power?
In: Engineering
When you turn A/C on the compressor gets power from one of the engine belts. The compressor turning puts more load on your engine therefore reducing fuel economy. The stereo and subwoofer use electricity which is generated by your alternator. The alternator like the A/C compressor runs off an engine belt as well but the alternator is always running so the only way you could potentially lose fuel economy is if the stereo/subwoofer use enough electrical current to rob power from the engine’s ignition system (spark plugs). The A/C will definitely effect fuel economy, the stereo or subwoofer is debatable depending on how much electrical current is provided by the alternator.
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