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Is there any way to drop 230V AC to 200 V AC by using resistor? I want to drop voltage before applying to a 12 0 12V 500mA transformer. If yes what will be its rating?

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    \$\begingroup\$ The answer to this question (Reducing voltage with resistors) applies: It only works if the load current is predictable and constant. A better solution is to choose a regulated "transformer" that is capable of accepting 200 V input. \$\endgroup\$
    – The Photon
    Oct 21 '15 at 16:34
  • \$\begingroup\$ You might be able to get away with a 6.8µF high voltage (eg. 275VAC MPX/MKP) bipolar series capacitor, but it highly depends on your load. A capacitor may work in some cases, but certainly not all. \$\endgroup\$
    – jippie
    Oct 21 '15 at 16:59
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One way to do this is with another transformer. A 230vAC:30VAC connected to oppose the voltage will work. However you could also replace the transformer since it is only a small (12VA) transformer.

If you are trying to adapt a Japanese standard product to 230VAC you may find that there are primary taps on the transformer that you can use.

Using a resistor is not a good idea generally because the voltage drop will vary with loading.

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