As perdas em vazio (perdas no ferro) nos componentes eléctricos ocorrem quando a energia é fornecida à máquina ou ao componente sem que seja gerada qualquer energia útil. Na engenharia eléctrica, por exemplo, os motores eléctricos, os transformadores ou as fontes de alimentação são afectados por perdas em vazio. No caso dos transformadores, as perdas em vazio resultam da tensão nominal sem carga.
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