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Generally, a galvanometer has a current sensitivity of the order of 0.1 mA and a small internal resistance of about 500 ohms. As such, it cannot measure high voltages. To measure high voltages, its range is extended by connecting a high resistance in series with the galvanometer as shown in the figure. If the galvanometer resistance is denoted by Rm and Im is the full-scale deflection current and the voltage to be measured is Vm volts, then the value of series resistance Rs is determined as under, R2 R5 R4 R3 prüngmigrimpningning = 1000 V 500 V 10 V Vm = ImRs + Im RM V-Rm I or R, I, 250V 50 V Range Selector Switch G - + O = m m m D.C. voltge measurement

Q1: A galvanometer has a current sensitivity of the order of 0.1 mA (full-scale deflection cuirent) and a small internal resistance of about 500 ohms. As such, it cannot measure high voltages. To measure high voltages, it was connected to multiple resistances in series with the galvanometer as shown in the figure. Find these series resistors (R, through R3). R5 R4 R3 R2 R1 gringningningning 1000 V 500 V 10 V 250 v 50 V Range Selector Switch G + - 1 D.C. voltge measurement