A corrente em vazio é um termo utilizado em engenharia eléctrica e descreve a corrente eléctrica que flui através de um transformador , por exemplo, quando este está ligado à tensão nominal mas não é carregado pelo consumidor. Devido à corrente em vazio, a potência perde-se principalmente sob a forma de perdas de calor. Por isso, é aconselhável minimizar as perdas em vazio e desligar o aparelho elétrico da rede de modo a que a corrente em vazio seja desligada.
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