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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( t ). A power source normally is described as V = V MAX SIN( t ). 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 SIN SIN max = =- External torque turns the wire loop at an angular velocity . The magnetic flux through this loop is B = B A COS (t) So the induced emf is When this emf is applied to a resistor, from Ohms Law, the current through this resistor is I = I MAX SIN( t ), With I MAX = V MAX / R . 2 Alternating Current and RLC Circuits...
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