Already have an account? Get multiple benefits of using own account!
Login in your account..!
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
The effects of back emf on circuit current:
In proving the time constant, it was stated that, at the instant the switch is closed, the current (I) is zero. This is because, at that instant in time the current in the coil and the flux surrounding the coil are both changing at their maximum rate. This rate of change of flux produces maximum back emf, the value being equal and opposite to the applied voltage. Therefore, with no potential difference across the circuit, no current can flow. This fact is quite simple to prove using the equation for the self induced emf in a coil and elements of the 'proof of time constant' above:
E = -L x dl/dt
The current starts from zero, and would rise to its maximum value in 1 time constant if the initial rate of change could be maintained.
The rate of change of current is therefore given by the gradient of line AB. The gradient of AB = BC/AC = Imax-0/Time constant.
IMAX can be calculated using Vsupply/R, because when the current reaches its maximum value it is no longer producing a changing flux and therefore not producing a back-emf. At this time, the whole supply voltage is dropped across the resistor.
State the principle of working of p-n diode as a rectifier. Describe, with the help of a circuit diagram, the use of p-n diode as a full wave rectifier. Illustrate a sketch of the
Define the characteristics of Heterojunction laser. Heterojunction laser: The threshold current density for homojunction lasers is extremely large because of poor optical an
is the surface of a conductor is equipotential
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
1. Fill a sink or bath tub with water. 2. Practice tapping the cork on the surface of the water (about 3 _times per second works well) to create evenly spaced waves. 3. Tappi
A solid substance has a molar volume which is smaller than that of its liquid phase. Which of the following statements regarding the solid-liquid phase transition is/are true?
The higher power level band is called as the conduction band. (i) It is also called as empty band of minimum energy. (ii) This band is partially filled by the electrons. (
Explain the meaning of Nuclear Fusion Fusion happens when two light atoms like hydrogen or lithium combine. There is a net loss of mass which is converted to energy. The most f
Explain the terms 'Magnetic Dip' and 'Magnetic Declination' with the help of relevant diagrams.
Explain the differences between heat transfer mechanisms in solids, liquids, gases (conduction, convection, radiation) Explain the combinations of substances, in terms of molecula
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd