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Homework Help: Maximum current through a capacitor

  1. May 10, 2017 #1
    1. The problem statement, all variables and given/known data
    A 2200 µF capacitor is charged to a potential difference of 12 V and then discharged through an electric motor. The motor lifts a 50 g mass through a height of 24 cm.
    The capacitor is charged to 12 V again and then discharged through a 16 Ω resistor
    Determine the time constant and the maximum current flowing through the circuit.

    2. Relevant equations

    C = Q/v
    RC = t
    V = IR

    3. The attempt at a solution

    The time constant would be RC = 35ms
    I feel like this should be really simple but I can't figure out the maximum current. I know when a capacitor charges or discharges the current is initially at a maximum then falls. If the maximum voltage across the resistor is 12V, then I figure the maximum current flowing would be 0.75A but that's wrong.
  2. jcsd
  3. May 10, 2017 #2


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    Science Advisor
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    Gold Member

    Did you use the information about the electric motor? If so, how?
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