Answer / sumit

since the induced emf in the dc motor oppose the votage
applied to the armature of a dc motor. so it is called the
back emf

Answer / vishnu gandhi

All windings have self inductance and mutual inductance. So
Lx dI/dt effect produces oppose to current which can be
termed as back emf. In case of Induction Motor the rotor
is short cicuited secondary of transformer which produces
it's own magnetic field and back emf is iduced in primary
winding which depend upon speed of rotor and
current.

Answer / dhaval busa

we take dc motor,when we apply voltage in dc motor the current is flow.the armature carrying conductor take current and cut the main field. according to faraday's law rate of change of flux,emf is induced but oppose the emf according to lenz's law.this emf called back emf

Answer / sathish

An EMF which comes backwards is called bach emf

where does core based current transformer is used? and what is the value of lux in a work station?

1 Answers   Space Matrix,

---

how meger function

0 Answers  

---

how to reduce power loss when the tranmission under long distance?

19 Answers  

---

why dc supply is not applied for step up or down in transformer

3 Answers  

---

what is the difference between home inverter and online ups?

2 Answers   ME,

---

what is phase voltage and phase current what is line current and line phase

3 Answers   L&T,

---

ro plant grundfos bm30type pump.we start the pump using siemens 3rw 4423-1bc44, 30kw soft starter. bur its failier frequently. so we planed to change the dol starter. sp please tell me any budy its possible or not翿შ†

1 Answers  

---

What is drain current of static relay?

1 Answers  

---

why in India it is maintained for exactly 50HZ frequency, why it is not that 49Hz,why it is so?

2 Answers  

---

What happened when we give 2 phase supply to a 1 phase equimpent. It's effect on equipment's efficiency and life?

5 Answers  

---

what parameters should we check to reduce the power bill

0 Answers  

---

What is the 415V AC Soft starter? Explain with an example?

1 Answers   TCS,

---