An electrodynamic meter used t measure power

An electrodynamic meter used t measure power
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wattmeter
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Description : An ammeter has a full-scale deflection current of 100mA. If the same ammeter is used to measure a full-scale current of 1.0ampere, what is the value of the shunt resistor in ohms if the voltage across the meter is 9.0 volts?

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