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electromagnet power

Discussion in 'Electronic Basics' started by lerameur, Jun 5, 2008.

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  1. lerameur

    lerameur Guest

    HI all,

    I just build two electro magnet with the same Gauss output, They have
    different iron core with different gauge size. They both output the
    same gauss with a 12v battery. I wanted to know if using a 24v
    battery, should I still be getting the same gauss?
    The finding of the same gauss was done by trial and error, I could not
    find a web site explaining size of core Vs gauge wire with the gauss
    output, anybody has a link to that, is there a general formula?

  2. lerameur

    lerameur Guest

    Just found a good link: answered my question

  3. terryS

    terryS Guest


    Not quite sure of your question:

    Be careful:

    If you apply twice the voltage to most citcuits twice the current will

    And you will be applying four times the power (watts) to the circuit.

    Power (which is measured in watts) = volts multiplied by amps.

    So at 12 volts. 12 x Amps = W watts.

    And at 24 volts 24 x Twice amps = 4W watts.

    Learn Ohm's Law: Absolutely basic to electrical voltage/current flow.

    Question: Re; your two electromagnets. Both on 12 volts.

    Is one taking more current than the other but has fewer turns of
    thicker gauge wire?

    Also is the one with more turns taking less current at 12 volts,
    because it is wound with thinner gauge wire. Therefore having a higher
    electrical resistance to current flow.

    Also that's not the whole story! It may be that you can only magnetize
    the metal cores to a certain 'saturation' point. Applying further
    electromagnetic power (volts times amps) to the circuit may only
    result in heating.
    Over heating will tend to destroy the magnet wires and could in some
    cases cause a fire.

    Am sadly out of date (some 55 years ago) but vaguely recall a formula
    (equation) that had 'Electormotive force' proportional to things such
    as the amount of current flowing through the coil, the number of turns
    in the coil (possibly squared?) , all modified (divided by) by the
    size of and permeability? of the core material.

    If can find the equation will post it here. But try looking up
    'Electragnetic Force' on Wikipaedia or something.

    Post back here what you find.
  4. Eeyore

    Eeyore Guest

    Isn't it Teslas these days ?

  5. Bob Eld

    Bob Eld Guest

    Tesla is an MKS or SI unit. Gauss is a CGS unit. a Tesla is 10^4 Gauss.
    What's 10,000 among friends?
  6. lerameur

    lerameur Guest

    The problem I had is that the two iron core where of different
    thickness. Both had the same size, but one has very thin waffle, like
    a 100 of them , the other iron core had about 15 waffle. Again both
    the same size. From what I experimented, thinner waffle produced a
    better electromagnet. Am i right by saying this?

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