Can Transformers Exhibit Gain When Tuned or Combined Uniquely?

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SUMMARY

Transformers do not exhibit power gain; they can only provide voltage gain at the expense of current or vice versa. The discussion highlights that step-up transformers increase voltage while decreasing current, and step-down transformers do the opposite. Additionally, it mentions that coupled inductors used in CB radio antennas can create voltage spikes when tuned improperly, but this phenomenon does not apply to transformers in the same way. Overall, transformers operate under the principle of conservation of energy, ensuring that power remains constant despite voltage and current variations.

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Jdo300
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Hello,

Are there any coil setups for transformers that when tuned or combined in weird ways run with gain? I heard that coupled inductors for CB radio antennas do this, but are there any effects similer to this for transformers? I heard an account from someone who said that two out of tune AC transformers tended to create big voltage spikes sometimes as the frequencies collided and created a lot of hash.

Thanks,
Jason O
 
Engineering news on Phys.org
Gain of what?
 
Any step-up transformer has voltage gain at the expense of current. Any step-down transformer has current gain at the expense of voltage. Also, both cases have loss as nothing is 100% efficient. NO transformer EVER has power gain.
 

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