What is the difference between the EMF equation considered in case of a transformer and in case of an induction motor?

Difference is that transformer is an alternating flux machine while induction motor is rotating flux machine. In an alternating flux machine frequency of induced EMF in primary and secondary side is same where as frequency of rotor EMF depends on slip.

What is the EMF equation of induction motor?

As the armature rotates, a voltage is generated in its coils. In the case of a generator, the emf of rotation is called the Generated emf or Armature emf and is denoted as Er = Eg. In the case of a motor, the emf of rotation is known as Back emf or Counter emf and represented as Er = Eb.

What is the EMF equation of a single phase transformer?

Equation of a Transformer. Where Em = Tωφm =maximum value of e. This is called as e.m.f. equation of transformer.

What is the formula for calculating emf?

If we know the resulting energy and the amount of charge passing through the cell. It is the simplest way to calculate the EMF. The electromotive force of cell….The Formula for Calculating the EMF.

\varepsilon	electromotive force
E	the energy in the circuit
Q	Charge of the circuit.

What is the formula for induced emf answer?

An emf induced by motion relative to a magnetic field is called a motional emf. This is represented by the equation emf = LvB, where L is length of the object moving at speed v relative to the strength of the magnetic field B.

What is back emf write the equation for the same?

The power from each device is calculated from one of the power formulas based on the given information. The back emf is ϵi=ϵS−I(Rf+REa)=120V−(10A)(2.0Ω)=100V. Since the potential across the armature is 100 V when the current through it is 10 A, the power output of the motor is Pm=ϵiI=(100V)(10A)=1.0×103W.

What is equation of back emf of dc motor?

For a DC motor, magnitude of the back emf is given by the same emf equation of a dc generator i.e. Eb = PɸNZ / 60A.

What is emf equation in transformer?

(Volts). Therefore, RMS value of emf per turn = Form factor X average emf per turn. Therefore, RMS value of emf per turn = 1.11 x 4f Φm = 4.44f Φm. This is called the emf equation of transformer, which shows, emf / number of turns is same for both primary and secondary winding.

What is induced emf?

Induced electromotive current is the induction of current in the loop just by changing the magnetic field. To be more accurate we can say that if the magnetic flux through a coil is changed then a voltage will be produced. This voltage is called the induced emf.

Is EMF the same as voltage?

Emf is the voltage developed between two terminals of a battery or source, in the absence of electric current. Voltage is the potential difference developed between the two electrode potentials of a battery under any conditions.

What is induced EMF?

Is induced current the same as emf?

Induced current is a component of an electrical load energized by voltage. A load connected to a circuit not energized will not draw current from the electric generator. Induced EMF is electromotive force generated by an Alternating Current electric generator. An example of EMF is how a Transformer works.

What is back EMF in induction motor?

Induced EMF in the rotor of the Induction motor can be called as Back EMF, which is analogous to back EMF of the DC motor. The equation of induced voltage in the rotor is Eb = s*E Where is E = stator emf s = slip of the induction motor

How do you find the EMF equation of a transformer?

To obtain the rms value of induced counter emf, divide this maximum value of e by √2. This is the EMF equation of transformer. This constant is called transformation ratio of transformer , if T 2 >T 1, K > 1, then the transformer is step up transformer.

How do you find the E1 value of induced EMF?

So the induced emf lags flux by 90 degrees. Putting the value of E 1 max in equation (6) we get Putting the value of π = 3.14 in the equation (7) we will get the value of E 1 as The above equation is called the turn ratio where K is known as the transformation ratio.

What is the equation of induced voltage in the rotor?

The equation of induced voltage in the rotor is Eb = s*E. Where is E = stator emf. s = slip of the induction motor. However there is a difference in the effect of back emfs of Induction motor and DC motor. In DC motor at the starting the back emf is zero, while in Induction machine Back emf is maximum.