交流电路-英文版.ppt

Exercise Given Determine R, C, P; draw phasor diagram. Exercise R1 = 60 ?, R2 = 25 ?, X1 = 40 ?, V3 = 50 V, V4 = 80 V, Determine V. Exercise Given R1 = 20 ?, R2 = 12 ?, XL = 16 ?, XC = 10 ?, Determine all the currents, P, power factor. Exercise Determine IC. Exercise R1 = 10 ?, L = 60 mH, R2 = 50 ?, C = 40 ?F, I3 = 2.5 A, ?= 500 rad / s, determine V, I1 , I2 , I , P. Exercise Determine I. Exercise Given XL = 3 ?, XC = 8 ?, R1 = 4 ?, R2 = 6 ?, V=100V, phase angle is 0?, determine VAB, Q, the circuit is capacitive, inductive, resistive ? Exercise For RLC series circuit, determine I, i, all the voltage, phasor diagram, P, Q, S. Exercise Determine V2, phase angles of V1, V2. Exercise Given Determine i, i1, i2. Exercise Given Determine all the values of meters, R, L, C. Exercise Given I1=10A、UAB =100V，determine the value of meters. Resonance the resonant circuit consists of an inductor and a capacitor together with a voltage or current source. Although the circuit is simple, it is one of the most important circuits used in electronics. In this chapter, we examine in detail the two main types of resonant circuits: the series resonant circuit and the parallel resonant circuit. Series resonance a simple series resonant circuit is constructed by combining an AC source with an inductor, a capacitor, and optionally, a resistor ZT = R + jXL – jXC = R + j(XL –XC) Series resonance Resonance occurs when the reactance of the circuit is effectively eliminated, resulting in a total impedance that is purely resistive ZT = R The total impedance of the series circuit at resonance is equal to the total circuit resistance, R At resonance, the total current in the circuit is determined from Ohm’s law as The voltages across each of the elements as follows: Series resonance The phasors and powers are illustrated graphically as following Parallel resonance A simple parallel resonant circuit is displayed as above. Parallel resonance