W08 314 HW05 Solutions

# W08 314 HW05 Solutions - EECS 314 Winter 2008 Homework set...

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EECS 314 Winter 2008 Homework set 5 Student’s name ___________________________ Discussion section # _______ (Last, First, write legibly, use ink) (use ink) Instructor is not responsible for grading and entering scores for HW papers lacking clear information in the required fields above Scores for the HW set: Problem 1 2 3 4 5 6 7 Total Score Problem 1 Energy stored in inductors and capacitors at DC Part 1 2 3 Total The Big Picture 1. Inductors store energy in the form of magnetic field. The energy W stored in the inductor equals 2 2 1 I L W = where L is the inductance and I is current through the inductor. Units: if L is in henrys and I is in amps, then W is in joules. 2. Inductors act as short circuits under DC steady-state conditions. There is no voltage drop across the inductor under DC steady-state conditions. 3. Capacitors store energy in the form of electric field. The energy W stored in the capacitor equals W = 1 2 C V 2 where C is the capacitance and V is the voltage across the capacitor. Units: if C is in farads and V is in volts, then W is in joules. 4. Capacitors act as open circuits under DC steady-state conditions. They do not conduct DC current, and the voltage across the capacitor is determined by the voltage across the circuit elements (sources, resistors, etc.), with which this capacitor is in parallel. 5. In order to calculate the energy stored in the inductors and capacitors under DC steady-state conditions, use the following strategy: a. Redraw the circuit replacing each capacitor with an open switch and each inductor with the closed switch. b. In this redrawn circuit, determine the current through each inductor (each closed “switch”) and the voltage across each capacitor (each open “switch”). 6. Then apply the formulas for energy listed above. Be careful with the units of measure! © 2008 Alexander Ganago Page 1 of 3

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