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    Electric circuit analysis problems

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    Electric circuit analysis problems. See attached file for full problem description.

    © BrainMass Inc. brainmass.com October 9, 2019, 6:03 pm ad1c9bdddf
    https://brainmass.com/physics/current-law/electric-circuit-analysis-problems-77024

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    SOLUTION

    Problem 1

    R=1 ohm I(mA)

    + 1

    V L= 400 mH I
    -

    4
    t (ms)

    For the inductive circuit we can write the following equation using Kirchhoff's loop law :

    V = RI + L dI/dt .........(1)

    From the given graph I vs t we can write the following equation for the current as a function of time :

    I = ¼ t ..........(2)

    Substituting For I from (2) in (1) :

    V = R(1/4 t) + L d/dt(1/4 t)

    Or V = (R/4) t + L/4

    Substituting R = 1 ohm, L = 400 mH = 0.4 H

    V = ¼ t + 0.1 .........(3)

    Voltage described by (3) will generate the current shown in the above graph. It is shown in ...

    Solution Summary

    Two problems on electric circuit analysis. Problem 1 dealing with current and voltage in an inductive circuit has been solved using Kirchhoff's loop law. Problem 2 deals with magnitude of current for opening of a fuse in an inductive circuit.

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