Difference Between Induced EMF and Current

Because of changes in the magnetic flux passing through a coil, a potential difference is created in the coil. To put it another way, it is claimed that the flux connecting with a wire or coil changes to produce electromotive force, or emf.

There are two ways to create electromotive forces:

• The first method entails positioning an electric conductor in a fluctuating magnetic field.

• The second method entails positioning a conductor that is constantly moving in a magnetic field that is static in nature.

Alternatively, When the magnetic flux connecting the conductor or coil changes, electromotive force, or EMF, is known to be induced.

Formula for Induced EMF:

1. Induced Emf in a Rod

$e=BLv$

Where, e= induced emf in a rod,

B= magnitude of magnetic field

L= length of the rod

v = speed of the moving object in relation to magnetic field

From the above equation, it can be inferred that induced emf is directly proportional to magnitude of magnetic field, length of the conducting rod and speed of the moving object in relation to magnetic field

2. Induced Emf Obeying Lenz’s Law: 

According to Lenz's law, a current will flow through the loop in response to an induced electromotive force with a different polarity in order to maintain the original magnetic flux there while the current is flowing. Alternatively, when magnetic flux linking a conductor charges, induced emf is generated. 

$e=-N\frac{\mathrm{d} \phi }{\mathrm{d} t}$

Where, e= induced emf

N= number of turns

Φ= magnetic flux

t= time

Electric Current: Greatest Invention of Humanity

Current is the movement of electrical charge in a closed circuit through a conducting body. Its SI unit is the ampere, represented by the letter A, and it is expressed in Coulombs per second. It demonstrates three unique characteristics:

• Heating Effect: When current travels through a conductor, heat is created. This heating effect is illustrated by:

$H=I^{2}RT$

• Magnetic Effect: When current flows through a conductor, a magnetic field is created. This is comparable to what happens when we place a compass near a wire carrying a lot of current and the needle begins to sway.

• Chemical Reaction: When current is transmitted through a solution, a chemical reaction is stated to take place, further dissolving the solution into ions.

Relationship Between Induced Electromotive Force and Current: 

During a number of tests conducted by Faraday, he identified the connection between induced EMF and current. He linked a galvanometer in series with a cylindrical coil composed of insulated copper wire. He then pushed a bar magnet up and down while orienting it so that the north pole was towards the coil. This produced the following findings that demonstrated the relationship between induced EMF and current:

• Whenever there is a relative motion between coil and magnet, the galvanometer shows a deflection testifying the idea that there is an induced emf in the coil.

• As the magnet's position changes, so does the direction of the current flow.

• The deflection is a function of the magnet's speed; in other words, the faster the magnet moves, the greater deflection it experiences, and vice versa.

Induced emf in a coil

Faraday’s Laws

According to Faraday's First Law, an electromagnetic field (EMF) is created when the magnetic flux across a coil gradually changes. The coil of the magnetic loop can be moved, rotated, the magnet can be moved near or far from the coil, and the position of the coil within the magnetic field can all be altered to alter the magnetic field's strength.

Faraday's Second Law: Faraday's law, which demonstrates the relationship between current and induced EMF, was built on the connection between induced EMF and current. According to Faraday's second law, the induced EMF is proportional to the flux's rate of change.

$e=-N\frac{\mathrm{d} \phi }{\mathrm{d} t}$

Where, e= induced emf

N= number of turns

Φ= magnetic flux

t= time

Differentiate Between Induced EMF and Current: 

Summary

The fundamental aspects of both concepts were perfectly portrayed in this article on what is induced emf and current as well as to differentiate between induced emf and current. Through Faraday's experiments, the relationship between induced emf and current was presented. A brief discussion of two of his experiments has been provided, illustrating the relationship between induced emf and current. The new concept of induced emf produced when  magnetic flux linking a conductor charges was introduced. The article also explored the origin of the phrase electromagnetic induction, which refers to both current and induced emf.