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Assuming you're asking about an electrical transformer...

Electricity meets resistance as it flows threw the transformer. Some of the flow of the energy is converted to heat due to the resistance and you get less electrical energy out than you put in. Think of electrical resistance as similar to friction between two objects, say rubbing your hands together quickly and generating heat.

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12y ago

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More answers

Due to the some energy losses...

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Dik Gup

Lvl 2
4y ago
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There re Eddy current loses in the coil

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Anonymous

4y ago
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Q: Why is the efficiency of a transformer less than 100?
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