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Formula for resistance in parallel circuit

  1. Apr 7, 2005 #1

    DB

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    My science teacher gave me this formula for resistance in parallel circuit.
    [tex]\frac{1}{R_{eq}}=\frac{1}{R_1}+\frac{1}{R_2}+\frac{1}{R_3}+.....[/tex]

    Thats exactly how he wrote it.
    I would like this using the summation sigma

    [tex]\frac{1}{R_{eq}}=\sum_{R=\frac{1}{R_n}}^n[/tex]

    Is that right? Im sure it's not lol....
     
  2. jcsd
  3. Apr 7, 2005 #2

    ZapperZ

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    Staff Emeritus
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    Not quite. You should write it as

    [tex]\frac{1}{R_{eq}}=\sum_{i=1}}^n \frac{1}{R_i}[/tex]

    Zz.
     
  4. Apr 7, 2005 #3
    [tex]\frac{1}{R_{eq}}=\sum_{i=1}^n \frac{1}{R_i}[/tex]

    Where n is the number of resistors and i is just a dummy letter (a counter).
     
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