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Unformatted text preview: v / t t = C v / i = (2000E-6)(100)/(100E-6) = 2000 sec P3.36 Describe the construction of inductors. Answer Inductors consist of coils of wire wound on coil forms such as toroids. P3.37 If the current through an inductor is decreasing in magnitude, is the energy flowing into or out of the inductor? Answer Because the energy stored in an inductor is W= Li 2 , the energy stored in the inductor decreases when the current magnitude decreases. Therefore, the energy is flowing out of the inductor. P3.38 If the current through an inductor is constant, what is the value of the voltage across the inductor? Explain why. Answer Because v L ( t ) = L di L ( t )/ dt , the voltage is zero when the current is constant. Thus we say that inductors act as short circuits for steady DC currents....
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- Fall '08