2007-02-17 23:23:20 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Physics
* If the magnetic flux in a circuit changes for any reason, then an Electric Field will be generated in the circuit - it is called an induced emf.
An emf can be produced in a circuit loop if:
* The B-field's strength varies with time,
B(t) constant.
Example: Turing on or off a magnetic field.
* The area of the circuit loop varies with time,
A(t) constant.
Example: Motional emf problems.
* The angle between B and A varies with time,
q(t) constant.
Example: Loop turning in a magnetic field.
2007-02-17 23:31:32 · answer #1 · answered by Esse Est Percipi 4 · 0⤊ 1⤋
Emf is the potential difference between the two electrodes of a cell or source when it is open that is no current is drawn from it. Induced emf is the emf developed in a conductor or in a circuit due to change in magnetic flux which further depends upon magnetic field, area of the coil or conductor and its orientation with the direction of the magnetic field also.
2007-02-18 00:25:19 · answer #2 · answered by Anonymous · 0⤊ 0⤋
What Is Induced Emf
2016-10-31 23:58:04 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Electromotive Force (EMF) is the voltage (volts) that pushes current (amperes) through an electrical component and the associated electrical circuit. A common analogy is a water piping system with a water tower tank that supplies the water pressure (similar to EMF) to push the water through the pipes (similar to the electric circuit).
Induced EMF refers to a coupling from one source of EMF to another. An example is the inductive EMF coupling from the primary to the secondary of a transformer as in a car's ignition coils.
2007-02-17 23:36:19 · answer #4 · answered by bobweb 7 · 0⤊ 0⤋
this is kind of complicated to explain...
anyway... emf stands for electromotive force... here is a better definition:
Electromotive force (emf) is the amount of energy gained per unit charge that passes through a device in the opposite direction to the electric field existing across that device. It is measured in volts.
emf is induced when a conductor cuts magnetic field lines or when the magnetic field through a coil changes.
hmm you can calculate induced emf by Faraday's Law. The equation can be found in the 2nd site listed below.
hope that helps =]
2007-02-17 23:32:54 · answer #5 · answered by leeloorox 2 · 0⤊ 0⤋
whenever magnetic lines r cut by a closed circuit, an induced current which lasts s long s d charge lasts. this emf which gives rise 2 induced current is called s d induced emf
this induced emf is generated whenever there is change in magnetic flux
emf= electromotive force
2007-02-17 23:50:48 · answer #6 · answered by shashi 1 · 0⤊ 0⤋
electromotive force
it is the amount of energy required to move the electron once through the complete circuit
induced emf is the emf created when there is external changing magnetic or electric field
since there is change in flux through the coil or wire emf is induced
2007-02-18 01:02:11 · answer #7 · answered by suhas_boeing 1 · 0⤊ 0⤋
E.M.F. is actually Electro Motive Force. It is measured in volts. It is the electrical pressure in a circuit. In other words it is the amount of force required to send a certain current through a certain resistance. You can calculate E.M.F. (Volts) in a circuit by dividing the resistance of the circuit (Ohms) by the current flowing in that circuit (amps).
If an alternating or even slightly changing current is passed through a conductor a magnetic field is created round that conductor. If another conductor is cut by that magnetic field a current is induced in that conductor. Let us look at a transformer. If you take a piece of insulated wire and make it into a 100 turn coil, then take, a longer, second piece of insulated wire and make it into a 200 turn coil wrapped around the first coil you have a transformer. If you pass an alternating current at say 10 volts through the first coil you will, in theory, find a potential difference across the ends of the second coil of 20 volts. When dealing with an alternating current you also have to account for impedance in the circuit which is the vectoral sum of the resistance, capacitive reactance and the inductive reactance. Hope that helps you a little.
2007-02-17 23:45:25 · answer #8 · answered by Tony A 6 · 0⤊ 0⤋
the potential diffrence belween two points in a circuit is emf.
when emf is induced due to change in flux linked with a circuit or coil is induce emf.the flux linked can be changed by moving conductor which is put between magnets
2007-02-17 23:56:23 · answer #9 · answered by vikram s 1 · 0⤊ 0⤋
dear ma,emf is ELECTRO MOTIVE FORCE. this will born when a current flow in a wire OR winding & this is knowned as induced emf.
2007-02-17 23:55:47 · answer #10 · answered by Anonymous · 0⤊ 0⤋