A combination of three resistors R1, R2 and R3 in series is connected across a voltage source Vr. The voltage drop across R1 and R3 are 10 V and 36 V, respectively. If the current supplied by the source voltage is 1.4 A and the total power supplied by the source is 70 W, Calculate the following: A. The value of Vr and the voltage drop across R2 (Ans. VT B. The equivalent resistance across the voltage source, and the values of R1, R2 and R3 (Ans. Req 50 V, V2 = 4 V) 2.8571 N, R3 = 35.7143 N, R¡ = 7.1429 N, R2 = C. The power dissipated by each resistor (Ans. P1 = 14 W, P2 = 5.6 W, P3 = 50.4 W) = 25.7143 N)

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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.