How do you measure the energy in an ELECTROMAGNET?

Question

How do you measure the energy in an ELECTROMAGNET and can you make it a little simple and if there are any thing in the formula which has its own formula which i have to answer so write that down as well the formula of it and write fown the formula of the question.

Answer 1

Finding the energy P(watts) is pretty simple as with all electromagnets its a coil wrapped around an iron core and the shared (induced) field is chocked full of flux lines. These flux lines are like most magnets convergent at the poles and radiating at the midpoints. the formula for Power in watts is P=I x E for a DC or simple AC circuit. the I=amperage and the E = voltage of the system..
HOWEVER ..I felt i detected another question that was hidden in the more liberal one you asked...One that could have been written like this "How is the STRENGTH of the magnet measured?"..If I'm wrong stop right now but if there is any merit to this please find a moment to read the answer ..In measuring the strength of the magnet one must first have a UNIT of measurement to work with ..In other words a pratical name that can be convert into some useful number..For now lets just use POUNDS ..a 10 pound magnet will lift 10 pounds and lets say it will lift it very fast say 32 ft/sec (look familiar) ..for this to be true a magnet needs to be energized to a FIELD STRENGTH of ten pounds ,Plus the opposing forces which want to hold the body at rest (gravity) ..A unit of gravitational attaction is the G.U. (gravity unit) I'm going to add a link that has lots of formulas in it but don't get all blown out over those just look at the easy reading part and also the units. Like Miligals and nanotesla, webers etc. All of these are in some form of another related to gravity which is the first cousin to magnetism. Heres the link:
http://www.science27.com/S11.htm
heres the formulas:
1 nanotesla = 10-9 tesla
=10-9 weber/m2
=10-1 lines/m2
=10-5 lines/cm2
=10-5 gauss = 1 gamma
All these do is describe the magnetic flux density in the region ..The same can apply to the electromagnet.From an electrical point of view if we vary the voltage on the coil by increasing the voltage we can increase the magnetic capacity of the electromagnet but as we raise the voltage to a point then we must raise the iron core ratio . If one was to put a voltmeter in line with the coil you could experiment with its lifting capacity . Plotting that against the voltage you can work out a curve that would properly evaluate the efficiancy and weight it would lift at a certain voltage from there we could predict the ability for your electromagnets strength. Now if you just wanted to know what the power consumption formula was ..well its P= I x E but to find its strength you wanted to find,, it takes much more than just a formula...READ that link on Anti gravity,,,,good luck with this from the E...

Answer 2

Average Energy = 0.5 * L * I^2

L is the inductance of the electromagnet in Henries
I is the current in Amps (squared)
Energy is in Joules

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Answer 3

Use a hall effect sensor.