University:
Amherst College
Course:
PHYS 117 | Introductory Physics II: Electromagnetism and Optics
Academic year:

2024
Views:

176

Pages:

11
Author:

barretina7q0

Capacitors and Inductors Capacitor • Stores charge and energy. Q  CV I C dV dt • Energy: U C  12 CV 2 • Energy density: uE  12  0 E 2 Inductor • Stores magnetic flux and energy. N  B  LI dI   L dt • Energy: U L  12 LI 2 • Energy density: uB  1 2 B2 0 Capacitors and Inductors in AC Circuits Capacitor Vmax  I max X C 1 XC  C • XC = “capacitive reactance” • Current leads voltage (ICE) Inductor Vmax  I max X L X L  L • XC = “capacitive reactance” • Current lags behind voltage (ELI) Power P  IV Power dissipated by a resistor: P  I 2R V2 P R Power Figure 30.15a Power Figure 30.17a Power Figure 30.16a George Westinghouse Thomas Edison Nikola Tesla C_RRENT WARS DC’s Deficiency Mutual Inductance • Emf will be induced in a coil when the flux d  through that coil is changing:     Bnˆ dA dt • That flux could be produced by current in a different coil: B  I  dB  dI dt dt • So, a changing current in one coil, induces an dI1 emf in another coil:  2  M dt • M = mutual inductance, a geometric and materials property. Transformer Figure 29.24 Figure 29.26

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