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“In the Circuit Shown in the Figure, Find the Total Resistance of the Circuit and the Current in the Arm AD” In the picture, how are they getting the current answer? I don't get it. Which method is that?

“In the Circuit Shown in the Figure, Find the Total Resistance of the Circuit and the Current in the Arm AD”
 
In the picture, how are they getting the current answer? I don't get it. Which method is that?

Question Image
Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

Addressing current in the branch issue

Total current = 3 amp ie sum total of currents from both the paths ABCD AND AD

Here they have used shortcut ie current in larger resistance will be less as compared to current in other and it will be divided in proportion of " opposite resistance to that of total "

You can solve or get the idea by applying nodal equations or mesh equations

Regards
Vikas TU
14149 Points
one year ago
Dear student 
In this question they first assume that there is open circuit along AD and find equivalent resistnce. 
Then 2 and 3 ohm will be in series. 
Then you can easily calculte. 
Hope this will help 
Good Luck 

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