Find the voltage V2 and the current Iı for the network shown below. 7A R 4Ω R 6DV ЗА
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.
In the circuit given, the voltage across each element is same because all the elements are connected in parallel to each other. The equivalent circuit with assumed direction of current in resistor R2 is shown below:
In the equivalent circuit, the voltage across both the resistors are same because they are connected in parallel. To get the expression between current I1 and current I2, equate voltage across both resistors, and apply Ohm’s law:
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