Since the self induction of the inductor resists the change of current in the circuit, this property is also called inertia of electricity.
What is known as electrical inertia?
Self-induction of coil is the property by virtue of which it tends to maintain the magnetic flux linked with it and opposes any change in the flux by inducing current in it. … That is why self-induction is called the inertia of electricity.
Why is self-inductance called back EMF?
The self-induced emf is also called the back emf as it opposes any change in the current in a circuit. … It is the electromagnetic analogue of mass in mechanics.So, work needs to be done against the back emf in establishing the current. This work done is stored as magnetic potential energy.
What do you mean by inductance of 1.0 Henry of a coil?
Then we can accurately define Inductance as being: “a coil will have an inductance value of one Henry when an emf of one volt is induced in the coil were the current flowing through the said coil changes at a rate of one ampere/second”. …
What is the electrical analogue of inertia?
There are two types of electrical analogies of translational mechanical systems. Those are force voltage analogy and force current analogy.
Torque Voltage Analogy.
|Rotational Mechanical System||Electrical System|
|Moment of Inertia(J)||Inductance(L)|
|Rotational friction coefficient(B)||Resistance(R)|
What is self induced emf?
Self Induced EMF :
It is defined as the emf induced in the coil due to increase or decrease of the current in the same coil. … When a current is passed to a circuit due to self induced emf the flow of current in the circuit is opposed .
What causes back emf in a DC motor?
A motor has coils turning inside magnetic fields, and a coil turning inside a magnetic field induces an emf. This emf, known as the back emf, acts against the applied voltage that’s causing the motor to spin in the first place, and reduces the current flowing through the coils of the motor.
Why is L used for inductance?
The symbol L for inductance was chosen to honor Heinrich Lenz (1804–1865), whose pioneering work in electromagnetic induction was instrumental in the development of the final theory. … Lenz’ gave us the minus sign and we honor him with the symbol L.
Can self inductance be negative?
Like mutual inductance, the self inductance of a circuit is measured in units of henries, and is a purely geometric quantity, depending only on the shape of the circuit and number of turns in the circuit. … This is not the case for mutual inductances, which can be either positive or negative.