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Physics

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What is the equivalent resistance of two resistors of 2 ohm and 3 ohm connected in parallel?

  • Physics -

    1/R = 1/R1 + 1/R2 = (R1 + R2)/R1 R2
    so
    R = R1 R2 / (R1+R2)

    = 6/5 = 1.2 Ohms

    to derive
    i1 = V/R1
    I2 = V/R2

    i = i1+i2 = V/R1 + V/R2
    but
    R = V/i = V/(V/R1 +V/R2) = 1/(1/R1+1/R2)
    = R1 R2 / (R2 + R1)

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