GATE EE 2019 Set 1 — Question 52
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Power Systems → Power System Protection → Circuit Breakers
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Question
The current flowing in the circuit shown below in amperes is ______.
Correct answer
0 to 0
Solution
Take the bottom rail as reference and let be the voltage of the top rail. The long plate of each cell is its positive terminal. In the and branches the positive terminal faces the top rail; in the and branches the positive terminal faces the bottom rail.Step 1: Source current of each branch (source emf / branch resistance)The first two push each towards the top rail; the last two, being reversed, push each away from it.Step 2: Node voltage (Millman's theorem)
Including the load branch (no source) in the denominator:Step 3: Current through the loadAnswer: A
Including the load branch (no source) in the denominator:Step 3: Current through the loadAnswer: A
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