why a high resistance is connected in parallel with galvanometer to convert it to voltmeter?

Question

anonymous · Answer

I think you mean in series?

anonymous · Answer

Yes. Back to the original question. A galvanometer measures current usually very small currents like 10 micro amps..  But Ohms law says voltage is proportional to current.  If you know the current flowing though a resistor say by connecting a galvanometer in series with the resistor you can calculate the voltage drop across the galvanometer and resistor.  AND if the resistance of the galvanometer is small compared to the resistor then the meter can be calibrated in volts and that voltage is nearly equal to the voltage across the galvanometer and resistor combination.  |dw:1360007517089:dw|