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Homework Help: Energy Stored in an Inductor, calculating inductance

  1. Sep 30, 2012 #1
    1. The problem statement, all variables and given/known data

    The electric-power industry is interested in finding a way to store electric energy during times of low demand for use during peak-demand times. One way of achieving this goal is to use large inductors. What inductance L would be needed to store energy 3.0 (kilowatt-hours) in a coil carrying current I= 300 A?

    2. Relevant equations

    U = 1/2 LI^2
    L = 2E / I^2

    3.0 kWh = 1.08*10^7

    3. The attempt at a solution

    2(1.08 * 10^7) / 900 A^2 = 24,000 H
  2. jcsd
  3. Sep 30, 2012 #2


    User Avatar

    Staff: Mentor

    ##300^2 \ne 900##
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