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Ideally both ways use the same amount of energy. But it is not desirable to operate a 9V CD player at 12V

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15y ago
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Q: Which uses less power a 9v CD player operating off of a WAGAN 12 v power supply inverter or a 9v CD player operating off a 12-volt-to-9-volt converter plugged to the WAGAN 12v power supply?
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