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Ohms

Discussion in 'Electronic Basics' started by [email protected], Apr 16, 2006.

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  1. Guest

    I have some 12vdc relays. I need them for a automotive circuit. They
    are 1440 ohm coils. If i hook them directly to the battery, will it
    burn them up. Do I need a resiter?
     
  2. If they are rated for 12 volt DC operation, they should work fine in
    this application. The voltage will be about 13.8 volts when the motor
    is running, but they should handle that extra bit. The coils will
    produce 13.8*13.8/1440= 0.132 watts. It is hard to overheat a coil
    with such a small power.
     
  3. Guest

    Thank you.
     
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