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
A linear circuit component is one that has a linear I V characteristic
Q. Carrier Modulation by Digital Signals? Digitally modulated signals with low-pass spectral characteristics can be transmitted directly through baseband channels (having low-p
how the clipper circuits are working? explanation of working of clipper circuits
The one line diagram of a simple power system is shown below. The data of the system are given in the table below. (a) Draw the impedance diagram of the system and mark all im
Q. Mention some characteristics of transistors? · When a NPN transistor is working, there is always a constant 0.6 volt drop between the base and emitter, i.e., the base is alw
Explain the Johnson Counters? The Johnson counters are a variation of standard ring counters with the inverted output of the last stage fed back to the input of the first stage
What is the main thing to look for in calculations of air gaps?
Logical Operations Various operations like and or exclusive or complement compare and rotate are called logical operations. Generally flags ( not all always) are modified
a) Get the best linear relationship in accordance with least square analysis for the following data:- X 0.9 2.3 3.3 4.5 5.7 6.7 Y 1.1 1.6 2.6 3.2 4.0 5.0 b) The table belo
Bureau of Energy Efficiency Setting up of the Bureau of Energy Efficiency The Bureau of Energy Efficiency has been established with effect from 1st March, 2002 under the
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