ACandRLC1

# ACandRLC1 - 1 Alternating Current and RLC Circuits...

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Unformatted text preview: 1 Alternating Current and RLC Circuits Alternating Current: the current direction changes with time. Compare with DC in which the current direction stays the same with respect to time, the magnitude of the current may change. A typical case in AC: I = I MAX SIN( ωt ). A power source normally is described as V = V MAX SIN( ωt ). Generation: rotating wire loops in magnetic field generate AC power. (demo: 32.18) Main advantages: for power generation (actually the magnet turns) and transmission. Review: DC on RC and RL circuit, and now pay attention to the current/voltage relationship in time. RC ) t ( V ) t ( BA dt d B ϖ ϖ ϖ Φ SIN SIN max = =- External torque turns the wire loop at an angular velocity ω . The magnetic flux through this loop is Φ B = B A COS (ωt) So the induced emf is When this emf is applied to a resistor, from Ohm’s Law, the current through this resistor is I = I MAX SIN( ωt ), With I MAX = V MAX / R . 2 Alternating Current and RLC Circuits...
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## This note was uploaded on 05/06/2008 for the course PHYS 1304 taught by Professor Ye during the Spring '08 term at SMU.

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ACandRLC1 - 1 Alternating Current and RLC Circuits...

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