use load resistors for AC or DC voltage

Discussion in 'General Electronics Chat' started by superway, Jul 30, 2014.

  1. superway

    Thread Starter Active Member

    Oct 19, 2009
    128
    0
    Hi,

    I know load resistors can be used for AC or DC application, but for accurate measurement and reading, should we use in separate application for AC or for DC voltage?
    For example: If I have a Coil Resistor rating 660W, 120vac, this is a load for AC application. If I use this AC load (660W, 120vac) to connect 54Vdc system, what is the disadvantage for measurement or affect anything? Should be used or not recommend for using?
    Thanks
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    For 50/60Hz and DC, wire-wound resistors are just fine. Wire-wound resistors have a sizable self-inductance, so are not suitable for frequencies where their reactance is significant.
     
  3. paulktreg

    Distinguished Member

    Jun 2, 2008
    611
    120
    Arcol HS200 aluminium clad power resistors are non-inductive if inductance is a problem.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    I would need to know what you mean by "Coil Resistor" before I could answer.

    A part number & link would be best.
     
  5. Ramussons

    Active Member

    May 3, 2013
    557
    92
    You can safely use that dummy load on your 54 VDC except you will be able to dissipate only about 170 Watts.

    Ramesh
     
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