10 n 220 V 10 n www 10 ww 400 200 100 ( A circuit contains a 220-V power source and several resistors. Determine the potential at point 'b' (bottom right corner of the circuit). Assume that the positive terminal of the battery is at 220 V.

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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.