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How can a moving coil galvanometer be converted into a voltmeter? Explain with a diagram. |
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Answer» Solution :To CONVERT a GALVANOMETER into a voltmeter, a high resistance is CONNECTED in series with the coil. The galvanometer with this modification is called a voltmeter. The value of the high resistance R to be connected in series with the coil depends on the maximum potential DIFFERENCE to be measured. If `I_g` be the current for a full scale deflection then, `V=I_g(G+R)` G is the resistance of the galvanometer . `therefore R=V/I_g-G ,I_g PROP V`  Since G and R are constants, the scale can be graduated to read potential differences directly.A voltmeter is used for measurement of potential difference. It should be connected in parallel in a circuit |
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