Inductor And Back Emf

I am planning to connect an inductor to a switch. Any rotating coil will have an induced emfin motors this is called back emf since it opposes the emf input to the motor.

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1 The Higher The Back Emf Produced By An Inductor A

The back emf of an inductor is what gives it a rising impedance characteristic with frequency.

Inductor and back emf. Counter electromotive force counter emf cemf also known as back electromotive force back emf is the electromotive force or voltage that opposes the change in current which induced it. How do i detect an inductors back emf on a breadboard. Cemf is the emf caused by magnetic induction see faradays law of induction electromagnetic induction lenzs law.

In other words if an increasing magnetic field induces an emf the resulting current will oppose a further increase. When you switch on the current the current through the inductor rises from zero to a particular value. In case of inductor at the instant when you open the switch back emf generated by inductor to oppose change in current is very high approx 1000v 10000v depending on the switching speed and initial conditions such a high voltage is capable of breaking air molecules and let charge flow through air thus this creates sparks between switch and circuitwireconnector while disconnecting them and this is when your magnetic field collapses as current in inductor starts decaying slowly obviously.

A large solenoid produces a back emf when the current through it is suddenly changed. This back emf is produced as a result of lenzs law which says that in a circuit with an induced emf caused by a change in a magnetic field the induced emf causes a current to flow in the direction that opposes the change in flux. How do i detect this back emf when the switch is opened.

Look at the equation for the impedance of an inductor versus frequency and look at the output impedance of your signal source to understand the amplitude of the voltage across the inductor. So there is a change in the current through the inductor which in turn by its property of self inductance will try to oppose that change by creating a back emf which appears across the inductor. Its value can be calculated using the formula.

A back emfalso called a counter emf is an emf created across an inductor by the changing magnetic flux around the conductor produced by a change in current in the inductor. I have read when you open a switch the inductor creates a back emf.

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