page_title: Ohm
hierarchical_section_title: Ohm
caption_attribution_description: English: Fig.549 From illustration caption: Leeds and Northrup one ohm standard resistance (Reichsanstalt form) Русский: Фиг.549 Подпись под иллюстрацией: Образцовое сопротивление номиналом 1 Ом фирмы Leeds and Northrup. English: Public Domain source: Hawkins Electrical Guide, Volume 2 Chapter 27: Testing and Testing Apparatus, Page 477 Copyright 1917 by Theo. Audel &amp; Co. Printed in the United States
context_page_description: The ohm is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm. Various empirically derived standard units for electrical resistance were developed in connection with early telegraphy practice, and the British Association for the Advancement of Science proposed a unit derived from existing units of mass, length and time, and of a convenient scale for practical work as early as 1861. As of 2020, the definition of the ohm is expressed in terms of the quantum Hall effect.
context_section_description: The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm. Various empirically derived standard units for electrical resistance were developed in connection with early telegraphy practice, and the British Association for the Advancement of Science proposed a unit derived from existing units of mass, length and time, and of a convenient scale for practical work as early as 1861. As of 2020, the definition of the ohm is expressed in terms of the quantum Hall effect.
caption: A laboratory one-ohm standard resistor, circa 1917.
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