lecture 10: inductance & capacitance nilsson 6.1-6.5 eng17 (sec. 1): circuits i summer 1 2014 1...
TRANSCRIPT
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Lecture 10: Inductance & CapacitanceNilsson 6.1-6.5
ENG17 (Sec. 1): Circuits I
Summer 1 2014
July 8, 2014
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Overview
• Inductors• Capacitors• Series-Parallel L/C• Mutual Inductance• Self Inductance• Energy Stored
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What Does an Inductor Do?
• Inductor: electrical component that opposes any change in electrical current
• Associates electrical current and magnetic fields
• Magnetic field generated by charge in motion (i.e., current)
• If current changes wrt time, mag field changes wrt time– Varying mag field results in voltage in linked
conductor
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Add’l Note
• Inductors can store energy through the mag fields– Used in spark plugs
• Inductors do not generate energy, so they are still passive devices
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Overview
• Inductors• Capacitors• Series-Parallel L/C• Mutual Inductance• Self Inductance• Energy Stored
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What Does a Capacitor Do?
• Capacitor: electrical component that consists of 2 conductors separated by dielectric
• “Stores” electric charge (like a battery)• Associated with electric fields, due to
separation of charge (voltage)• If voltage varies with time, E-field varies with
time– Varying E-field generates displacement current in
space occupied by field– Capacitance relates displacement current to voltage
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Example
Under DC conditions, find i, vc, and iL.Also, find the energy stored in the capacitor and inductor.
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Overview
• Inductors• Capacitors• Series-Parallel L/C• Mutual Inductance• Self Inductance• Energy Stored
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Overview
• Inductors• Capacitors• Series-Parallel L/C• Mutual Inductance• Self Inductance• Energy Stored
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Overview
• Inductors• Capacitors• Series-Parallel L/C• Mutual Inductance• Self Inductance• Energy Stored
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Overview
• Inductors• Capacitors• Series-Parallel L/C• Mutual Inductance• Self Inductance• Energy Stored