Back EMF Calculator

Category	Engineering ↺
Engineering	Electrical ↺
Electrical	Machine ↺
Machine	Dc Machine ↺
Dc-Machine

✖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.ⓘ Voltage [V]			+10% -10%
✖Armature Current is the Current which Flows in Armature Winding or rotating Winding of Motor or generator.ⓘ Armature Current [Ia]			+10% -10%
✖The Armature resistance is given is the opposition that a substance offers to the flow of electric current.ⓘ Armature resistance [Ra]			+10% -10%

✖Electromotive force is the capability of the system to make the charge flow.ⓘ Back EMF [ε]

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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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