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I have a question about a transformer. I need to know about the input voltage. If i were to buy a neon sign transformer that says it is an input (primary) of 120 volts and an output (secondary) of 15 kilovolts, do I have to give it 120 volts on the primary? The ending voltage does not matter. All I need to know is if I give it a different voltage, will it still work?

My second question is: Can I flip a transformer around and put voltage on the secondary to get a different on the primary? Just wondering!!!

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