7-2 A function generator can be angle modulated with various waveforms. Based on a 50-Hz sinusoid before modulation is applied, the output signal with modulation is v(1) = 20 cos(100t + 6mt) Determine (a) instantaneous signal phase and (b) instanta- neous signal frequency (radian and cyclic). (c) Sketch the forms of the instantaneous signal phase and frequency.

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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.