The sensors of a power meter use electrical circuits called bridges to detect changes in signal strength. These changes are detected by measuring the flow of the signals through four resistors. When bridge resistance is balanced, the output voltage is zero. When a signal passes through the resistors, they become unbalanced and produce voltage that ...
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http://www.used-line.com/glossaries/glossary.cfm?g_id=23
The nominal value of the individual legs that make up a complete Wheatstone bridge.
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https://www.encyclo.co.uk/local/20850
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