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).