As perdas de cobre em engenharia eléctrica são perdas de calor por corrente de vários componentes electrónicos, como transformadores, motores eléctricos ou geradores. As perdas são causadas, entre outras coisas, pela resistência óhmica no enrolamento de cobre. As perdas de cobre estão presentes tanto em corrente alternada como em corrente contínua e aumentam com a intensidade da corrente. Nos transformadores, as perdas no cobre são as perdas causadas pela corrente de carga nas bobinas.
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