Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
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!
Experiments conducted by Faraday and others using current carrying coils resulted in 'The Laws of Electromagnetic Induction' which state:1) 'If the magnetic flux threading through an electrical circuit changes, then an e.m.f. is induced in the circuit'. 2) 'The magnitude of the induced e.m.f. is proportional to the rate of change of the magnetic flux through the circuit'. (Faraday's Law)3) 'The induced e.m.f. has a direction such that the current which flows (or would flow if the circuit is completed) gives rise to magnetic effects that oppose the effects producing it'.(Lenz's Law)
These principle are widely used to convert mechanical power into electrical power - e.g the alternator.These are general principles that are true however the change in flux is produced. It may be due to:
The polarity of the emf produced will act to try to oppose the change causing it. If it is due to an external flux change, the induced emf will drive a current in the coil that itself produces a flux that opposes the change due to the external influence. If the flux change is due to a change in the current within the coil, the emf generated will act to oppose the change in current. This is called a 'back emf'. Faraday was able to quantify the effect and expressed the observations mathematically as:
v=-Ndq/dt (Faraday's Law)
where N is the number of turns on the coil and dq/dt is the rate of change of flux threading the coil. Effectively, each turn generates a back emf equal to dq/dt and since the emfs produced by each turn are in series, the total back emf is N times that ofeach turn considered separately
Q. The K map of a logic function is shown in Figure. (a) Obtain a POS expression and its corresponding realization. (b) For the purpose of comparison, obtain the correspondin
Electromechanical Meters Electromechanical energy meters are based on the Ferraris Principle (see note in the margin). The working of these meters is explained. Working o
General Purpose Diodes The general purpose diodes have relatively high reverse recovery time. The diodes are general made by diffusion. They are used in low speed app
Q. Illustrate Computer-controlled routing? Computers are employed in network with common channel signaling (CCS) features. In CCS, there is a separate computer-controlled signa
Q. A 10-hp, 230-V dc shunt motor takes a full- load line current of 40 A. The armature and field resistances are 0.25 and 230 , respectively. The total brush-contact drop is 2 V,
a) Illustrate the Schematic diagram of the Transformer Box used in the Practical Session b) Calculate the output voltage on an Oscilloscope and determine its amplitude and freq
following on from the first tma in this module, produce a design report for one design of the product based on one of the scenarios covered on the following pages.
Q. With a direct current of I A, the power expended as heat in a resistor of Ris constant, independent of time, and equal to I 2 R. Consider Problem and find in each case the effe
#quest explain cro..
Q. Write short notes on the Stability Factor of Biasing circuits. The degree of success achieved in stabilizing Ic in the face of variations in Ico is expressed in terms of sta
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd