what is eddy current ?

156 views
what is eddy current ?
by

1 Answer

Answer :

In magnetic circuits when we supply current to coil which wound on some core( of iron cast iron, ferrite ) material it produce magnetic field but there is small amount of flux which also links which core material produced small value of current in core called as eddy current this current non desirable and it produces heat and losses in magnetic circuits..for good working conditions we always try to minimize eddy current
Like 0 like
by

Please log in or register to answer this question.

Related questions

92 views
Which of the following can reduce the Eddy current losses?

Description : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

Last Answer : Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

1 answer
388 views
A ferrite core has less eddy current loss than an iron core because?

Description : A ferrite core has less eddy current loss than an iron core because?

Last Answer : A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

1 answer
73 views
How eddy current can be minimized?

Description : How eddy current can be minimized?

0 answers
3.0k views
What is the difference between eddy current and hysteresis loss?

Description : What is the difference between eddy current and hysteresis loss?

Last Answer : Loss occurred by magnetising and demagnetising process is called histerisis loss and the current flowed due to the magnetic field produced by the electric field applied is called eddy current losses

1 answer
126 views
How eddy current is produced in a transformer?

Description : How eddy current is produced in a transformer?

0 answers
98 views
Give two applications of each : 1) Eddy current sensor 2) Optical sensor.

Description : Give two applications of each : 1) Eddy current sensor 2) Optical sensor.

Last Answer : Eddy current sensor : 1. Detection of non-magnetic but conductive materials. 2. Displacement sensing 3. Position sensing Optical sensor : 1. Position Detection 2. Velocity Detection 3. Acceleration Detection 4. Direction Detection

1 answer
108 views
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.

Description : The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Last Answer : The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

1 answer
2.3k views
Eddy current damping cannot be used for moving iron instrument because

Description : Eddy current damping cannot be used for moving iron instrument because

Last Answer : Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

1 answer
295 views
The disc of an instrument using eddy current damping should be of?

Last Answer : The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

1 answer
748 views
Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Description : Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.

Last Answer : Hysteresis loss: Hysteresis loss is a loss which occurs due to the friction of magnetic domain due to the change in magnetic field in ferromagnetic material like iron. Hysteresis loss causes power loss ... loss in transformer is given by, We=Kef2Kf2Bm2watts Skin effect limitations:

1 answer
69 views
How eddy currents are generated?

Description : How eddy currents are generated?

0 answers
240 views
Eddy currents are induced in the pole shoes of a D.C. machine due to?

Description : Eddy currents are induced in the pole shoes of a D.C. machine due to?

Last Answer : Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.

1 answer
226 views
Direct Current (DC)

Description : Direct Current (DC) Next Topic : Alternating current (AC)

Last Answer : Direct Current (DC) is the unidirectional electric current. Uni meaning is one. And the flow of charge in same direction. We know that conventional current flow from positive terminal of battery to ... The magnitude of DC may constant or vary but direction do not change with respect to time.

3 answers
185 views
Alternating current (AC)

Description : Alternating current (AC)

Last Answer : AC stands for Alternating Current meaning voltage or current that changes polarity or direction respectively over time. An Alternating Current (AC) is an electric current whose magnitude ... energy are known as alternators and are simpler construction than DC electromechanical generators.

2 answers
106 views
Does current flow through a capacitor ?

Description : Does current flow through a capacitor ?

Last Answer : Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

1 answer
150 views
What kills, current or voltage?

Description : What kills, current or voltage?

Last Answer : Current would kill. You can actually have thousands of bolts going through you and not even know it. Yes you probably know already voltage is current times resistance. Since your body is a resistor it would take just a small amount of current to create a very high voltage

3 answers
424 views
A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?

Description : A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?

Last Answer : The current is 10.0A.  1ampere = 1 Coulomb per 1 second.  0.1Coulombs ÷ 0.01seconds = 10.0amperes.

1 answer
5.3k views
Describe the difference between direct and alternating current.

Description : Describe the difference between direct and alternating current.

Last Answer : Direct current is the flow of electricity or charge in one direction..  Alternative current is the flow of charge that doesn't flow in one direction. 

4 answers
100 views
Explain why potential difference is necessary to produce current in a circuit.

Description : Explain why potential difference is necessary to produce current in a circuit.

0 answers
2.6k views
Kirchhoff's Current Law

Description : Kirchhoff's Current Law

Last Answer : Kirchhoff's current law

1 answer
71 views
Current ratio

Description : Current ratio

Last Answer : Current ratio

1 answer
2.6k views
Current divider rule

Description : Current divider rule

Last Answer : Current divider rule

1 answer
80 views
Current formula

Description : Current formula

Last Answer : Current formula

1 answer
80 views
Capacitive current formula

Description : Capacitive current

Last Answer : Capacitive current formula

1 answer
170 views
How to find total impedance Z, current I and Impedance angle ?

Description : How to find total impedance Z, current I and Impedance angle ?

Last Answer : How to find total impedance Z, current I and Impedance angle ?

2 answers
115 views
Why inductor current lags inductor voltage ?

Description : Why inductor current lags inductor voltage ?

Last Answer : Inductor is a wire wounding structure having a core material it induces emf which is opposite to the voltage supply and proportional to rate of change of current so current lags the voltage in inductor

1 answer
146 views
Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

Description : Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

Last Answer : When two alternating quantities attain their respective zero or peak values simultaneously, the quantities are said to be in-phase quantities. When the quantities do not attain their respective zero or ... current is leading the voltage or the voltage is said to be lagging behind the current.

1 answer
1.1k views
List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Description : List out any four effects of electric current used in measuring instruments & write name of meter working on it.

Last Answer : Effects of Electric Current used in measuring instruments:  1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.  2. Electromagnetic induction ... . Electrostatic effect: Voltmeters.  5. Hall Effect: Flux meter, Poynting vector wattmeter.

1 answer
129 views
State various effects of electric current and explain any one.

Description : State various effects of electric current and explain any one.

Last Answer : Effects of Electric Current:  1. Magnetic Effect: When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current carrying ... The rise in temperature is converted into elongation of hot wire element causes displacement of pointer. 

2 answers
113 views
In a series R-C circuit, with the increase in frequency, current

Description : In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Last Answer : In a series R-C circuit, with the increase in frequency, current Increases

1 answer
486 views
A 1000Ohm, 1 Watt resistor can safely pass a current of

Description : A 1000Ohm, 1 Watt resistor can safely pass a current of

Last Answer : A 1000 Ohm, 1 Watt resistor can safely pass a current of 30 mA

1 answer
130 views
Step-down transformer converts high voltage and low current into:

Description : Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

Last Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current

1 answer
267 views
Which of the following is the least expensive protection for over current in low voltage system?

Description : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

Last Answer : Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

1 answer
249 views
For a round wire, the approximate value of fusing current is given by

Description : For a round wire, the approximate value of fusing current is given by

Last Answer : For a round wire, the approximate value of fusing current is given by  K√d3

1 answer
130 views
A current controlled voltage source is equivalent to :

Description : A current controlled voltage source is equivalent to :  (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier

Last Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier

1 answer
123 views
A network that consists of at least a voltage source or current source is called

Description : A network that consists of at least a voltage source or current source is called A) Active network B) Ideal network C) Sourced network D) Outsourced network

Last Answer : A network that consists of at least a voltage source or current source is called Active network

1 answer
108 views
The current flow in a battery is due to ______

Description : The current flow in a battery is due to ______ A) movement of ions B) movement of protons C) movement of holes D) movement of neutrons

Last Answer : The current flow in a battery is due to movement of ions

1 answer
280 views
The initial rate of rise of current through a coil of inductance 10 H when suddenly...

Description : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs.

Last Answer : The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is 20 Vs

1 answer
978 views
When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

Description : When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

Last Answer : When an alternating current passes through an ohmic resistance the electrical power converted into heat is true power.

1 answer
1.2k views
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?

Description : The equation of 50 Hz current sine wave having r.m.s. value of 60 A is?

Last Answer : (60*√2)Sin(2π*50*t)

2 answers
103 views
The frequency of an alternating current is?

Description : The frequency of an alternating current is?

Last Answer : The frequency of an alternating current is the number of waves passing through a point in one second.

1 answer
314 views
Magnitude of current at resonance in R-L-C circuit?

Description : Magnitude of current at resonance in R-L-C circuit?

Last Answer : The current will be maximum if it is a series rlc circuit.

2 answers
274 views
In the case of an unsymmetrical alternating current the average value must always be taken over?

Description : In the case of an unsymmetrical alternating current the average value must always be taken over?

Last Answer : In the case of an unsymmetrical alternating current the average value must always be taken over the whole cycle.

1 answer
413 views
In a loss-free R-L-C circuit the transient current is?

Description : In a loss-free R-L-C circuit the transient current is?

Last Answer : In a loss-free R-L-C circuit the transient current is sinusoidal.

1 answer
139 views
Inductance affects the direct current flow?

Description : Inductance affects the direct current flow?

Last Answer : Inductance affects the direct current flow at the time of turning on and off.

1 answer
864 views
The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.

Description : The r.m.s. value of a sinusoidal A.C. current is equal to its value at an angle of______degrees.

Last Answer : 45

2 answers
145 views
Why does induction motor have high starting current?

Description : Why does induction motor have high starting current?

Last Answer : In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor

2 answers
107 views
What is the relationship between power and current?

Description : What is the relationship between power and current?

Last Answer : P = I2R Where P = power I = Current R = Resistance This the relationship between current and power.

2 answers
106 views
What happens to the resistance when the current increases?

Description : What happens to the resistance when the current increases?

Last Answer : Resistance  reduces  when  current  increases.

1 answer
210 views
Do cell phones use AC or DC current?

Description : Do cell phones use AC or DC current?

Last Answer : DC of course.

2 answers
...