Tomgångsspänningen är den elektriska spänningen vid polerna på en spänningskälla när ingen belastning är ansluten och därför ingen belastningsström flyter.
I elektriska apparater, t.ex. transformatorer, motsvarar tomgångsspänningen utspänningen i obelastat tillstånd. Eftersom ingen ström flyter finns det inga spänningsrelaterade förluster i kablarna eller lindningarna.
Tomgångsspänningen är en viktig parameter för att bedöma driftsegenskaperna och fungerar som referens för jämförelse med spänningen under belastning.
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