Energy stored in a magnetic field , Electrical Engineering

Energy stored in a magnetic field

Consider a circuit consisting of a voltage supply,  switch,  resistor  and  a  coil  of  N turns wound on a toroid of length l, all in series.

 

208_Energy stored in magnetic field.png

With the switch open, no current flows inthe coil and therefore there is no flux produced in the core of the coil.

 

1326_Energy stored in magnetic field 1.png

 

At t=0, the switch is closed and the current builds up with time. It is not instantaneous,because the coil produces a back emf that limits the rate of rise of current

 

 

2133_Energy stored in magnetic field 3.png

 

where v = the time dependent back emf created by the coil. The instantaneous power being delivered
by the supply at time t is

vs .i=i2 R+v.i

 

986_Energy stored in magnetic field 4.png

237_Energy stored in magnetic field 5.png

 

Posted Date: 8/22/2012 6:48:23 AM | Location : United States







Related Discussions:- Energy stored in a magnetic field , Assignment Help, Ask Question on Energy stored in a magnetic field , Get Answer, Expert's Help, Energy stored in a magnetic field Discussions

Write discussion on Energy stored in a magnetic field
Your posts are moderated
Related Questions
Q. Why a common collector amplifier is called an emitter follower?         When the input voltage goes through its positive half cycle, the output voltage is also seen to go th

This question investigates the effect of extending the data set with zero-padding & of the appropriate time in the workflow to apply a window function. To get finer resolution in t

Question 1 State and Explain Kirchhoff's Voltage and Current Law Question 2 State and prove Thevenine's Theorem Question 3 What is a filter? Design a Constant -K band Pa

Q A beam containing two types of charged particles is moving from A to B. Particles of type I with charge +3q, and those of type II with charge -2q (where -q is the charge of an el

What is USB? USB: The USB (UNIVERSAL SERIAL BUS) is intended to join peripheral devices as keyboards, modems, a mouse and sound cards to the microprocessor by a serial data pat

Ask questertion #Minimum 100 words accepted#

Q. Show the Subtraction Method? For this procedure (method), start with a weighted position value greater that the number. If the number is greater than the weighted position f

1. Why must a modem be used to transmit binary data through a PSTN? (1) Use sketches and additional text to describe the following modulation methods. (a) Amplitude shift key

The subject of electrical measurements is such a large one that entire books have been written on the topic. Only a few basic principles will be introduced here. Practical measurem

Demand Side Management Demand side management refers to programmes implemented through utilities to modify consumer load profile. Energy efficiency programmes decrease energy