Elektrovaakuumtakisti ehk raudvesiniktakisti on vesinikuga täidetud klaasist kolb, milles asub raudtraat ja mis on loodud hoidma vooluahelas konstantset voolu olenemata pingekõikumistest.
A barretter element or iron-hydrogen resistor is a hydrogen-filled glass bulb in which an iron wire is located, and designed to maintain a constant current flow in a circuit despite variations in voltage.
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