Question
A voltmeter consists of a $25\Omega$ coil connected in series with a $575\Omega$ resistor. The coil takes 10mA for full scale deflection. What maximum potential difference can be measured by this voltmeter?
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Answer
Full deflection current $=10\text{mA}=(10\times10^{-3})\text{A}$$\text{R}_\text{eff}=(575+25)\Omega=600\Omega$
$\text{V}=\text{R}_\text{eff}\times\text{i}=600\times10\times10^{-3}=6\text{V}.$
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