18. Obtain the equivalent resistance at the terminals a-b for each of the circuits given. 30 12 www 30 12 www 102 100 ww www 10 £2 www 3 2012 200 25 2 www 1022 2012 ww www 502 ww www 15 Q2

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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.