Ex5: For the network in Fig. a. Find the total impedance Z7 and the admittance Yr. b. Find the source current I, in phasor form. c. Find the currents I, and I, in phasor form. d. Find the voltages V, and Vab in phasor form. e. Find the average power delivered to the network. f. Find the power factor of the network, and indicate whether it is leading or lagging. 300 N L, = 0.1 H ll is R1 + e = V2(50) sin 27 1000t Vab C 1 µF L = 0.2 H b ll + 51

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.