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A string of 29 identical Christmas tree lights
are connected in series to a 120 V source. The
string dissipates 65 W.
What is the equivalent resistance of the
light string?
Answer in units of Ω

  • physics -

    Power = 65 W = V^2/R
    V = 120 V

    where R is the resistance of the string. Solve for it

    The number of lights is not needed.

  • physics -

    205.7142857 ohms

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