Analog Milliamp Meter Used as Voltmeter circuit

  
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A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale current of the meter movement. So, if you have a 1 milliamp meter and you want to read 0-10 volts you will need a total resistance of 10/.001 = 10K ohms..
Analog Milliamp Meter Used as Voltmeter circuit - schematic




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