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no, the transformer is much more efficient

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HOWEVER- a transformer only changes the voltage of AC current- it does not change it to DC. You will still need diodes or rectifiers. You can also use a motor/generator- a 230v AC motor turns a 12 v DC generator.

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Q: Will using a transformer to convert 230V to 12V DC consume more energy than using a few capacitors and resistors without a transformer?
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