Nikita Suryawanshi
Vellore Institute of Technology (VIT), Vellore
Nikita Suryawanshi has created this Calculator and 100+ more calculators!
Devyaani Garg
Shiv Nadar University (SNU), Greater Noida
Devyaani Garg has verified this Calculator and 25+ more calculators!

11 Other formulas that you can solve using the same Inputs

m of Moving Iron Ammeter
Multiplying Power=(Rm/Rsh)*sqrt((1+((Omega*Inductance)/Rm)^2)/(1+((Omega*Shunt Inductance)/Rsh)^2)) GO
m of Moving Iron Voltmeter
Multiplying Power=sqrt(((Rm+Rs)^2+(Omega*Inductance)^2)/((Rm)^2+(Omega*Inductance)^2)) GO
Voltage of Moving Iron Voltmeter
Meter Voltage=Im*sqrt((Rm+Rs)^2+(Omega*Inductance)^2) GO
R<sub>s</sub> for AC Operation (Full Wave)
Rs=(RMS value*Sensitivity (ac))-Rm-(2*R diode) GO
R<sub>s</sub> for AC Operation (Half Wave)
Rs=(RMS value*Sensitivity (ac))-Rm-R diode GO
R<sub>s</sub> for DC Operation (Full Wave)
Rs=(RMS value*Sensitivity)-Rm-(2*R diode) GO
R<sub>s</sub> for DC Operation (Half Wave)
Rs=(RMS value*Sensitivity)-Rm-R diode GO
R<sub>sh</sub> of PMMC based Ammeter
Rsh=(Im*Rm)/(Current (measured)-Im) GO
R<sub>s</sub> of PMMC based voltmeter
Rs=(Voltage (full range)/Im)-Rm GO
m of PMMC based Ammeter
Multiplying Power=(1+Rm)/Rsh GO
m of PMMC based voltmeter
Multiplying Power=1+(Rs/Rm) GO

1 Other formulas that calculate the same Output

Value of I<sub>m</sub>
Im=Voltage (total)/(0.1*(Rm+R2)) GO

Value of I<sub>m</sub> Formula

Im=(Voltage*Unknown Resistance)/(Resistance 1*Rm+Unknown Resistance*Resistance 1+Unknown Resistance*Rm)
Iₘ=(E*R<sub>x</sub>)/(R<sub>1</sub>*Rₘ+R<sub>x</sub>*R<sub>1</sub>+R<sub>x</sub>*Rₘ)
More formulas
Value of R<sub>1</sub> GO
Value of R<sub>2</sub> GO
Value of R<sub>h</sub> GO
Value of R<sub>h</sub> GO
Value of S GO

How to mark zero reading?

To mark zero reading on the scale, the terminals are shorted and Rx is made zero. Now, no current is flowing in the circuit D'Arsonal movement indicates zero current.

How to Calculate Value of Im?

Value of Im calculator uses Im=(Voltage*Unknown Resistance)/(Resistance 1*Rm+Unknown Resistance*Resistance 1+Unknown Resistance*Rm) to calculate the Im, The Value of Im formula is directly dependent on the unknown resistance connected to the ohmmeter as well as the voltage across it. Im and is denoted by Iₘ symbol.

How to calculate Value of Im using this online calculator? To use this online calculator for Value of Im, enter Voltage (E), Unknown Resistance (Rx), Resistance 1 (R1) and Rm (Rₘ) and hit the calculate button. Here is how the Value of Im calculation can be explained with given input values -> 0.517241 = (15*25)/(20*5+25*20+25*5).

FAQ

What is Value of Im?
The Value of Im formula is directly dependent on the unknown resistance connected to the ohmmeter as well as the voltage across it and is represented as Iₘ=(E*Rx)/(R1*Rₘ+Rx*R1+Rx*Rₘ) or Im=(Voltage*Unknown Resistance)/(Resistance 1*Rm+Unknown Resistance*Resistance 1+Unknown Resistance*Rm). Voltage is the value of the voltage applied in the ohmmeter, Unknown Resistance is the value of the unknown resistance connected for measurement, Resistance 1 is the current limiting resistance in an ohmmeter and Rm is the internal resistance of the coil in PMMC instrument.
How to calculate Value of Im?
The Value of Im formula is directly dependent on the unknown resistance connected to the ohmmeter as well as the voltage across it is calculated using Im=(Voltage*Unknown Resistance)/(Resistance 1*Rm+Unknown Resistance*Resistance 1+Unknown Resistance*Rm). To calculate Value of Im, you need Voltage (E), Unknown Resistance (Rx), Resistance 1 (R1) and Rm (Rₘ). With our tool, you need to enter the respective value for Voltage, Unknown Resistance, Resistance 1 and Rm and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Im?
In this formula, Im uses Voltage, Unknown Resistance, Resistance 1 and Rm. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • Im=Voltage (total)/(0.1*(Rm+R2))
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