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EMF equation of DC GeneratorE = (ΦNPZ) / (60 * A)
where,
E = e.m.f induced in any parallel path in armature
Φ = flux per pole in weber
N = armature rotation in revolutions per minute (r.p.m)
P = No.of generator poles
Z = total number of armature conductors
A = No.of parallel paths in armature
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoE.M.F.(rms)/phase = 4.44* Kp * Kd * Fi(Flux)* f * T Volts
where Kp is the pitch factor which is the ratio of the coil voltage to the voltage of the full pitch coil.
Kd is the distribution factor; reduction in the emf due to the distribution of coils.
Fi is the flux, f is the frequency & T is the turns.
Wiki User
∙ 14y agoe=N d/dt(flux linking with the coil)
When the magnetic flux linking with the coil, having N number of turns, changes with respect to time, the emf will induced. This is stated by Lence law.
Wiki User
∙ 11y agothe emf equvation of single phase transformer is 4.44fNaB
Wiki User
∙ 12y agoEph = 4.44 f Nph Φ (Volts)
f - frequency
Nph - no of conductors per phase
Eph - EMF induced per phase
Φ - flux linkage
Wiki User
∙ 12y agoe= N*change in flux/ change in time N-is the number of loops
Flux equation is BA cos(angle) A-Area
or
e=Blv v-is the velocity B-is the magnetic field l-is the length
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What does the emf equation of asingle phase transformer do?
The emf equation of signal phase transform
How initially voltage build up in an alternator by residual magnetism?
The residual flux will help the phenomenon of changing flux. So that emf generation takes place.
How are emf measured?
emf in volts
Why electrical supply are multiple of 11kv?
It is due to presence of form factor(Kf) in the emf equation of Alternators and transformers. Value of form factor is 1.11.
Does motional emf call induced emf?
yes indused emf is also called motional emf. If an open coil is subjected to a variable magnetic field, at the ends of the coil a potential difference is induced which is called induced emf. If a coil is connected to an emf source and switched on, the rising current will produced an variable magnetic field which in turn produces an emf. It is called back emf.
How is emf induced in an alternator?
EMF or electromotive force, i.e.Voltage, is generated when the magnets inside the alternator turn within the wire coil of the alternator.
What does the emf equation of asingle phase transformer do?
The emf equation of signal phase transform
Derive emf equation of a DC machine?
equation of ac machine
What is emf equation for synchronous machine?
ediot
What three things are required to produce EMF in an alternator?
armature, stator, rotor
What is the emf equation of induction motor and prove it?
f=4.44fqm
What will happen if generator is overexcited?
if a generator is overexcited it is producing a large amount of reactive power which requires an increase in the alternator emf. To produce this emf, the rotor currents must increase resulting in extreme ohmic rotor losses.
What is the VOLTAGE equation of alternator?
V=1.11KF.Kd.ZNA/60...........?
How initially voltage build up in an alternator by residual magnetism?
The residual flux will help the phenomenon of changing flux. So that emf generation takes place.
Emf equation for transformer?
E1 = 4.44 f N1Øm (for primary)E2 = 4.44 f N2Øm (for secondary)
When finding the emf of a redox reaction by Ered cathode - Ered anode and a half-reaction is reversed on the chart do you flip the sign of its reduction potential?
No, because the chart shows reduction potentials. Ered cathode - Ered anode = emf just requires you to plug in the reduction potentials the way they are. A common equation is Ered cathode + Eox anode = emf, in which case you would have to flip the sign of the anode's reduction potential, since you would need its oxidation potential. But the equation Ered cathode - Ered anode = emf is simpler and probably formed to be that way.
Is potential difference always less than emf of the cell?
No. Because during charging process of a battery current flows in opposite direction to the discharging/consumption. so equation Emf=P.d. +Ir is changed to Emf=p.d. +Ir. Hence during charging process of a battery Potential difference is greater than electromotive force.
