How Do Generators Use Electromagnets

How Electromagnetic consecration can exist used to generate electricity

Baronial 5, 2019 Nov 29, 2020 0 564

Introduction to Electromagnetic consecration

Electromagnetic induction is the procedure of producing a voltage by using a magnetic field and current in a complete circuit. It was first discovered past Michael faraday he started his work by using a different combination of wires, magnetic strengths, and currents

Electromagnetic consecration is created by moving a conductive substance through a magnetic field. When the magnet moves back and forth a current will be induced in the wire

What is Magnetic Flux

It will be like shooting fish in a barrel to empathise electromagnetic induction if we know about the magnetic flux. The magnetic flux is depended upon the magnetic flux density and the coil, it is proportional to these two qualities. Magnetic flux is the product of magnetic flux density and the area normal to the lines of magnetic flux. Unit of measurement of magnetic flux is weber (Wb)

How to calculate the corporeality of magnetic flux

The amount of magnetic flux tin be calculated past the equation

φ = BA cos θ
φ = the amount of magnetic flux in webers (Wb)
B = magnetic flux density
A = cross-exclusive expanse
Θ = angle between the magnetic field lines and normal to the cross-exclusive area

The flux nosotros calculated is the flux through one turn of the curl in social club to calculate the magnetic flux In all the turns of the coil, nosotros need to use a quantity called magnetic flux linkage which can exist defined as

Nφ =NBA cos θ

Northward is the number of turnings

How can we alter the flux over a flow of time

To change the flux we tin motility the magnet or wire away or towards
The area can be increased or decreased to modify the flux
A wire tin be rotated forth an axis which is perpendicular to the field thus irresolute the angle between the area and magnetic field vectors

Induced E.M.F

Factors affecting the magnitude of induced e.m.f

Larger current is produced

If the magnet is moved at a faster speed in and out of the coil
A Stronger magnet can exist used
Turns in the whorl is increased
The soft iron cadre can be inserted in the roll to increase the electric current

No E.Thou.F is produced

If the magnetic field is stationary outside or inside the roll
If there no relative move between the magnet and the coil

Applications

Electric power generations

Electrical generators follow the same method to produce e.g.f by moving the conductor

An electromagnetic blood menses meter

It is used to detect the flow rate of arterial claret, it uses the EMF induced in the flowing blood. A magnetic field is ready upward across the artery, and the connection is made to ii pocket-sized electrodes in contact with the artery

Forever flashlight

It uses the EMF principle to eliminate the need for batteries

Transformers

The principal coil electric current moves back and forth beyond the secondary coil the moving magnetic field caused by the changing field volition create a electric current in the secondary scroll

Microphones

Sound waves enter the filter of a microphone, a diaphragm is situated in the filter the sound waves volition vibrate the diaphragm which in turns moves the coil and the whorl is wrapped around a magnet, then the movement of the wire in the magnet will create a current in the wire.