Relay coil data sheet. Resistance varies with wattage?

Discussion in 'General Electronics Chat' started by Mrdouble, Apr 2, 2016.

  1. Mrdouble

    Thread Starter Member

    Aug 13, 2012
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    0
    image.jpeg I ordered couple relays off relay and just reading the datasheet. Can someone explain what the coil resistance varies with wattage? Resistance doesn't change of a coil in DC so what am I missing. Maybe I'm interpreting it wrong. I'm interested in the 12 v

    Thanks in advance
    Micheal
     
  2. #12

    Expert

    Nov 30, 2010
    16,318
    6,818
    If you bought a 12 volt relay that needs 0.15 watts, it will have a resistance of 960 ohms in the coil.
    ....................................................... 0.2 watts..............................................720.............................
    ....................................................... 0.36 watts............................................400............................
    ....................................................... 0.45 watts.............................................320.............................
     
  3. Mrdouble

    Thread Starter Member

    Aug 13, 2012
    82
    0
    Ahh, so you think different coils within the 12v lineup? That hadn't crossed my mind
     
  4. Mrdouble

    Thread Starter Member

    Aug 13, 2012
    82
    0
    Ok, I'm with you but why would anyone choose anything but the lowest wattage coil?
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,026
    3,236
    Perhaps cost or operating speed.
     
    Mrdouble likes this.
  6. #12

    Expert

    Nov 30, 2010
    16,318
    6,818
    Maybe a hotter coil wattage can slam bigger contacts together properly.
     
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