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!
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.
A stone drops from the edge of the roof. It passes the window 2 m high in 0.1s . How far is the roof above the top of the window? Solution) Height of the window (h) = 2m Acce
Describe principal section and optic axis of a doubly refracting material.
what is the difference between a supplementary unit and fundamental unit
The conductive method Heat can be transferred by conduction from warmer to cooler objects, the quantity of heat transfer depends on the temperature difference between the two
Points O, A, and P lie in one as well as the same vertical plane. Point A is 4 . 0 cm due east of point O starting at point O one is able to arrive at point P by going 6 . 0 cm due
tau-theta paradox (1950s): While two distinct types of kaons, tau & theta (today tau is a completely different particle) decay, tau decays in three particles, whereas the thet
Determine where r is the position vector.
A convex lens of refractive index 1.5 of focal length 0.2m is immersed in water of refractive index 1.33. Determine the focal length of lens in water.
In computing the electric field at some point P in the x-y plane of a Cartesian coordinate system due to a linear charge distribution in the x-y plane each contribution to the elec
The Saturated calomel electrode (SCE) is a reference electrode based on the reaction among elemental mercury & mercury (I) chloride. The aqueous phase in contact with the mercury a
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd