4. A circuit has impedance of 3.464+j2.0 ohm is supplied from a source voltage of 240 volts, 60 Hz. What is the current when resistance is reduced by 50%? A. 91 A B. 60A С. 72 A D. 54A 5. A resistance of 30 ohms and an inductive reactance of 60 ohms are in series across 120 volts, 60 cycles source. Find the power factor in percent of the circuit? A. 45 В. 67 6. A series RLC circuit is excited by a 100 volts 79.6 Hz source. Resistance R is 100 ohms, inductance L is 1 H and capacitance C is 5 micro farad. Calculate the voltage across C. С. 87 D. 75 A. 353.5/45° C. 70.7/-45° B. 332.6/35° D. 282.8/-135°

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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.