Analysis of electric voltage measurements using an ampermeter based on the electric circuit studio application

Abstract

Ammeters are usually used to measure electric current. An ammeter connected in series with a resistor can be used to measure voltage. In order for the ammeter to be used to measure voltage, it is necessary to know the internal resistance of the ammeter. The electric circuit studio application is used to see what if the ammeter is positioned as a voltmeter. The ammeter begins by pairing it in parallel with the resistance whose voltage is to be measured. Based on the results of the discussion, it is concluded that in this way we can determine the internal resistance of the ammeter but it cannot be used to measure the electric voltage because the voltage drop across the resistance measured is very small and does not match the expected measurement results. Furthermore, the ammeter is added to the series resistance and then installed in parallel with the resistance to be measured. Based on the results of the discussion on the use of the ammeter in this way, it can be concluded (1) the series resistance given must be very large in size, namely more than 100kΩ and above, (2) the magnitude of the electric voltage measurement can be calculated by multiplying the results of the ammeter reading by the series resistance used and (3 ) the amount of internal resistance in the ammeter cannot be determined because it produces a negative internal resistance value during calculation.