230v 250 Watt Heaters operating at 70 Watt with 120v

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  • xboxhaxorz
    Senior Member
    • Jan 2011
    • 196

    #1

    230v 250 Watt Heaters operating at 70 Watt with 120v

    I have the heater mentioned above, and when i plug it in to the wall socket at 120v i only get 60 to 70 watts, i tested this using a kill o watt.

    I figured if it wasnt operating at 230v then it would simply take longer to heat or even operate at half the voltage, but at a max of 70 watts im not sure why this is occurring any information is helpful.
  • mariushm
    Badcaps Legend
    • May 2011
    • 3799

    #2
    Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

    The heating element has the same resistance no matter the input voltage:

    Watts = V x V / R

    250w = 230v x 230v / R -> R = 230x230/250 = 211 ohm

    120v :

    Watts = V x V / R = 120vx120v / 211 ohm = 68.2 watts

    Same reason but the other way around is why 120v lightbulbs blow up when you use them in 230v sockets.

    Comment

    • xboxhaxorz
      Senior Member
      • Jan 2011
      • 196

      #3
      Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

      Thanks, makes sense

      I am fully aware of components blowing when providing too much voltage, i figured with half voltage they just worked half power

      Comment

      • mariushm
        Badcaps Legend
        • May 2011
        • 3799

        #4
        Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

        Yeah, think about it...

        ohm's law : v = i x r

        Power = v x i ... but from above v = i x r or i = v/r so if you replace, then power = i x i x r or power = v x v / r

        It's just basic formulas.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

          Half voltage, quarter the power.

          There are fake 240V to 120V conversion devices on the 'net which have a single diode in them to chop 240V AC into pulsed DC 0-240V peak.

          Like this: http://www.amazon.com/Jensen-1600-Po.../dp/B000BB7B82 way to small to be an actual 1600W converter.

          From an immediate perspective one would think this would half the power provided by 240V and so equalling the power provided by 120V, and that this would work for heaters, lightbulbs, cookers, etc not dependent on peak voltage.

          However, what it actually does is double the power compared to pure 120V, because power is squared... so it fries them.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • xboxhaxorz
            Senior Member
            • Jan 2011
            • 196

            #6
            Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

            Is there something i could use in say a bud box with the heater that can tolerate 250 watts

            Either buy or make is of no issue, i would prefer not to get those huge transformers

            From my searching it doesnt appear to be to simple and i may need to just get this http://www.amazon.com/Goldsource%C2%...nsformers+220v

            Comment

            • mariushm
              Badcaps Legend
              • May 2011
              • 3799

              #7
              Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

              buy one of these if you want heat and light:

              http://www.amazon.com/Cooper-Lightin...gen+floodlight

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

                Is this thread related to the thread here?
                https://www.badcaps.net/forum/showth...831#post420831
                Never stop learning
                Basic LCD TV and Monitor troubleshooting guides.
                http://www.badcaps.net/forum/showthr...956#post305956

                Voltage Regulator (LDO) testing:
                http://www.badcaps.net/forum/showthr...999#post300999

                Inverter testing using old CFL:
                http://www.badcaps.net/forum/showthr...er+testing+cfl

                Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                http://s807.photobucket.com/user/budm/library/

                TV Factory reset codes listing:
                http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • xboxhaxorz
                  Senior Member
                  • Jan 2011
                  • 196

                  #9
                  Re: 230v 250 Watt Heaters operating at 70 Watt with 120v

                  yes that is correct

                  i have various heaters which are all 230v but with different wattages

                  250, 500, and 600

                  they actually say 230v on the heaters themselves

                  Comment

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