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Building an electro magnet

  1. Jul 26, 2012 #1
    This might be too simple of a question but i am building an electro magnet and breaking down all of the components for sheer practice. when i measure my coils resistance it came to roughly between .9Ω and 1.3Ω... what battery (what voltage should i use to get the most power from my magnet and does it matter if it is going to be used in pulses like a relay?
  2. jcsd
  3. Jul 26, 2012 #2
    Re: omes

    It's spelled "ohms". And, your question doesn't make sense. For example, take a battery with a voltage 1 MV (megavolt).
  4. Jul 26, 2012 #3
    Re: omes

    I'm sorry spelling isnt my strong point. What i'm trying to ask is how strong of a battery can i use before I run into a problem (such as Arking and/or flash welding) because of too much current.
  5. Jul 26, 2012 #4
    Re: omes

    Take a look at this table of wire gauges and current rating:
    Wire Size
    and see what the max current the wire in your coil can support is.
  6. Jul 26, 2012 #5
    Re: omes

    Ok but my friend warned me that with the amount of rotations around the iron core i have could possibly just drain my battery. would it be better to get a power supple like a AC/DC converter from a wall outlet instead of a regular battery?

    Thanks again and sorry for how little i know about physics.
  7. Jul 27, 2012 #6


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    Staff Emeritus
    Science Advisor

    Re: omes

    Make sure to control the current flowing through the circuit in some way. Just attaching a coil to a battery may result in a destroyed battery due to very high currents. Add some resistors or something. (Or use a current limiting power supply)

    Do you know much about electricity or circuits? And especially Ohms law?
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