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Urvi Rathod
Vishwakarma Government Engineering College (VGEC), Ahmedabad
Urvi Rathod has created this Calculator and 100+ more calculators!

11 Other formulas that you can solve using the same Inputs

Series Generator Terminal Voltage
Voltage=Induced voltage-(Armature Current*(Armature resistance+Series field resistance)) GO
Shunt Generator Terminal Voltage
Voltage=Induced voltage-(Armature Current*Armature resistance) GO
Velocity of an electron due to voltage
Velocity due to voltage=((2*[Charge-e]*Voltage)/[Mass-e])^1/2 GO
Energy Stored in Capacitor when Capacitance and Voltage are Given
electrostatic potential energy=1/2*Capacitance*Voltage^2 GO
Shunt Field Current
Shunt Field Current=Voltage/Shunt field resistance GO
Energy Stored in Capacitor when Charge and Voltage are Given
electrostatic potential energy=1/2*Charge*Voltage GO
Capacitance
Capacitance=dielectric constant*Charge/Voltage GO
Field Current
Field Current=Voltage/Shunt field resistance GO
Power Generated When The Armature Current Is Given
Power=Induced voltage*Armature Current GO
Converted Power
Power=Induced voltage*Armature Current GO
Output Power
Power=Voltage*Load current GO

6 Other formulas that calculate the same Output

EMF For DC Generator
Electromotive Force=Flux per pole*Number of pole*Motor Speed*Number of conductors/60*Number of parallel paths GO
EMF For DC Generator For Wave Winding
Electromotive Force=Flux per pole*Number of pole*Motor Speed*Number of conductors/120 GO
EMF of unknown cell using potentiometer
Electromotive Force=(EMF of unknown cell using potentiometer*Length)/Final length GO
EMF Of Dc Machine When Constant Of The DC Machine Is Given
Electromotive Force=Constant Of The DC Machine*Angular Speed*Flux per pole GO
The EMF Generated Per Path For A Lap-winding
Electromotive Force=(Motor Speed*Number of conductors*Flux per pole)/60 GO
Motional EMF
Electromotive Force=Magnetic Field*Length*Velocity GO

Back EMF Formula

Electromotive Force=Voltage-(Armature Current*Armature resistance)
More formulas
Shunt Field Current GO
Shunt Generator Terminal Voltage GO
Field Current GO
Armature Current GO
EMF For DC Generator For Wave Winding GO
EMF For DC Generator GO
The EMF Generated Per Path For A Lap-winding GO
Constant Of The DC Machine GO
Angular Speed Of The Dc Machine GO
EMF Of Dc Machine When Constant Of The DC Machine Is Given GO
Power Generated When Torque is Given GO
Power Generated When The Armature Current Is Given GO
Series Generator Terminal Voltage GO

How does back EMF affect supply voltage?

As the back emf depends on the current their value also decreases. The magnitude of the back EMF is nearly equal to the supply voltage. If the sudden load is applied to the motor, the motor becomes slow down. As the speed of the motor decreases, the magnitude of their back emf also falls down.

How to Calculate Back EMF?

Back EMF calculator uses Electromotive Force=Voltage-(Armature Current*Armature resistance) to calculate the Electromotive Force, The back emf opposes the supply voltage. The supply voltage induces the current in the coil which rotates the armature. The electrical work required by the motor for causing the current against the back emf is converted into mechanical energy. And that energy is induced in the armature of the motor. Electromotive Force and is denoted by ε symbol.

How to calculate Back EMF using this online calculator? To use this online calculator for Back EMF, enter Voltage (V), Armature Current (Ia) and Armature resistance (Ra) and hit the calculate button. Here is how the Back EMF calculation can be explained with given input values -> 118.5 = 120-(0.5*3).

FAQ

What is Back EMF?
The back emf opposes the supply voltage. The supply voltage induces the current in the coil which rotates the armature. The electrical work required by the motor for causing the current against the back emf is converted into mechanical energy. And that energy is induced in the armature of the motor and is represented as ε=V-(Ia*Ra) or Electromotive Force=Voltage-(Armature Current*Armature resistance). Voltage, electric potential difference, electric pressure, or electric tension is the difference in electric potential between two points, which is defined as the work needed per unit of charge to move a test charge between the two points, Armature Current is the Current which Flows in Armature Winding or rotating Winding of Motor or generator and The Armature resistance is given is the opposition that a substance offers to the flow of electric current.
How to calculate Back EMF?
The back emf opposes the supply voltage. The supply voltage induces the current in the coil which rotates the armature. The electrical work required by the motor for causing the current against the back emf is converted into mechanical energy. And that energy is induced in the armature of the motor is calculated using Electromotive Force=Voltage-(Armature Current*Armature resistance). To calculate Back EMF, you need Voltage (V), Armature Current (Ia) and Armature resistance (Ra). With our tool, you need to enter the respective value for Voltage, Armature Current and Armature resistance 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 Electromotive Force?
In this formula, Electromotive Force uses Voltage, Armature Current and Armature resistance. We can use 6 other way(s) to calculate the same, which is/are as follows -
  • Electromotive Force=(EMF of unknown cell using potentiometer*Length)/Final length
  • Electromotive Force=Flux per pole*Number of pole*Motor Speed*Number of conductors/120
  • Electromotive Force=Flux per pole*Number of pole*Motor Speed*Number of conductors/60*Number of parallel paths
  • Electromotive Force=(Motor Speed*Number of conductors*Flux per pole)/60
  • Electromotive Force=Constant Of The DC Machine*Angular Speed*Flux per pole
  • Electromotive Force=Magnetic Field*Length*Velocity
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