(b) Appraise the pre and post power factor correction effect of using the capacitor bank to correct the overall power factor of the aireraft electrical supply system shown in Figure Q4(b). Draw a current phasor diagram to show the power factor correction effect. Derive an expression for the total capacitance required to raise the overall circuit power factor to unity (1.0). IFc IN Legend: ZL = Rµ + jX1 (Lighting) ZFc = Rfc + jXfc (Flight Control) ZN = RN + jXN (Nav and Comms) C Zrc ZN Figure Q4(b)

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A: The solution can be achieved as follows.

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Q: 1.

A: We will apply nodal analysis to find node voltage the current  I1 to I 5.

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.