Time constant in inductors, Physics

Assignment Help:

Time constant in Inductors:

It is impossible to decide exactly when the maximum point is reached on an exponential curve, or when the curve has fallen to exactly zero.   To enable calculations to be performed a  time constant is used. The time constant gives an indication of the time taken for the current to rise to its maximum value or fall to zero. The time constant is defined as either:

  • The time taken for a current to reach its maximum value if the initial rate of increase were maintained.
  • The time taken for the current to reach 0.632 of its maximum value (or 63.2%).

The latter definition arises since it is found that after one time constant, the current has always built up to 63.2% of its maximum value.  The time constant for a series LR circuit is given by:

          Time Constant  = L/R seconds

Therefore, although it is not possible to say exactly when the current reaches its maximum value, for all practical purpose it can be considered a maximum after 5 time constants:

          Maximum Current flows after 5L/R

 

 


Related Discussions:- Time constant in inductors

Motion animation, Motion Animation A car along with a non-zero initial ...

Motion Animation A car along with a non-zero initial speed has a constant acceleration whose value could be controlled through the user.

What is the difference between diffraction and interference, What is the di...

What is the difference between diffraction and interference? Diffraction is the bending of waves around an obstacle, whereas interference is the meeting of two waves. For exam

What is potential difference, A pith ball weighing 3.0 x 10 -2 N carries a ...

A pith ball weighing 3.0 x 10 -2 N carries a charge of -1.0 x 10 -6 C. The pith ball is placed among two large, parallel, metal plates that are divided by 0.050 m. What is

How far does the cue ball travel after strikes other ball, A cue ball on a ...

A cue ball on a billiards table travels at 1.0 m/s for 2.0 s. After striking another ball, it travels at 0.80 m/s for 2.5 s at an angle of 60.0° from its original path. a. How

Determine the thickness of the mica sheet, A parallel plate capacitor is ma...

A parallel plate capacitor is made from 25 plates, each 70mmby 120mm interleaved with mica of relative permittivity 5. If the capacitance of the capacitor is 3000pF verify the

G m counter, describe the construction and working of geiger muller counter...

describe the construction and working of geiger muller counter. give its important application.

Illustrate the working of optical-fiber infrasound sensors, Illustrate the ...

Illustrate the working of Optical-Fiber Infrasound Sensors. Optical-Fiber Infrasound Sensors: It is example of Mach-Zchnder Interferrometer. Optical-fiber infrasound sensors

Atomic physic, why rutherford''s atomic model is failure

why rutherford''s atomic model is failure

Define the period and the square root of the length, What is the relationsh...

What is the relationship among the period and the square root of the length? The graph is linear, so the period is proportional to the square root of the length of the string.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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