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Voltmeter sensitivity is usually expressed in ohms per volt. This means that a voltmeter with a sensitivity of 20 kilohms per volt would be a:
50 microampere meter
Sensitivity (ohms/volt) = 1 / Full-scale current (amperes). So, Full-scale current = 1 / (ohms/volt) = 1 / (20,000 Ω/V) = 0.00005 A = 50 microamperes.
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