Figure 3 show the arrangement of three resistors. The switch L is initially оpened. Calculate I1, I2 and I3. The switch L is now closed. Compute the new current for I1, I2 and I3. A light bulb has been introduced to replace E3. Describe any changes that can be observed in the circuit. 30 I R1 L 12V,20 E1 20V,20 E3 12 V, 12 R2 50 R3

Q: R7 XMM4 5600 R6 7800 R9 V2 R8 R10 12002 12V 7802 1ka

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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.