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To those who know a little bit about circuits

Discussion in 'Other Off Topic Forum' started by 0UTXLR8, Sep 19, 2004.

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  1. 0UTXLR8

    0UTXLR8 Formula Junior

    Apr 12, 2004
    366
    Full Name:
    Josh
    #1 0UTXLR8, Sep 19, 2004
    I need some help on one of my problems.

    Design an electric space heater to operate from 120V. Two heating elements with resistances R1 and R2 are to be used that can be operated in parallel, series, or separetely. The highest power is to be 1200 Watts and the lowest power is to be 300 Watts. What values are needed for R1 and R2? What intermediate power setting is available?

    Thanks in advance.
     
  2. Bdel

    Bdel Formula Junior

    Nov 3, 2003
    358
    Hollis, NH
    Full Name:
    Bruce
    #2 Bdel, Sep 20, 2004
    R1 = 24 ohm R2 = 24 ohm

    Put both R1 and R2 in series so total R = 48ohm

    power = v*v/r = 120*120/48 = 300W

    Put both R1 and R2 in parall so total R = 12 ohm

    power = v*v/r = 120*120/12 = 1200W
     
  3. VROOM!!!

    VROOM!!! Formula 3

    Feb 11, 2004
    2,495
    Los Angeles
    Full Name:
    Armen
    #3 VROOM!!!, Sep 20, 2004
    Wow! Thats confusing!
     
  4. 0UTXLR8

    0UTXLR8 Formula Junior

    Apr 12, 2004
    366
    Full Name:
    Josh
    #4 0UTXLR8, Sep 20, 2004
    Awesome that is what I got. Thank you.
     

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