2. Three resistors R1, R2 and R3 are connected in series parallel with R1 in series with parallel combination of R2 and R3. The whole combination is connected across a 120V DC source. Resistors R1, R2 and R3 takes 750 w, 250 W and 200 W, respectively. Calculate the resistance R2. Why are street lights connected in parallel and not in series, explain.

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A: As we have given : R1=R2=10 Ω

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A: V=120V P across R1=750 W P across R2=250 W P across R3=200 W

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A: Simulation Result: Measurement of currents: I1" = -142mAI2" = -708mAI3" = 566mA

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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.