sequential (56) Voltage Common different mode

 https://kamchihau.blogspot.com/2022/09/blog-post.html

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Ref: https://wodewangzhishime.blogspot.com/2022/06/httpswodewangzhishime_10.html .

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Me: The "black dot" indicate the direction of the flow of the current. . In the upper picture, circuit A and B have same direction of the flow of the current . As a result, the resistance of both circuit is high.

John: But, in the lower picture, circuit A and circuit B have different direction of the flow of the current. . As a result, the resistance of both circuit is low.

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If (direction of current flow = same)

{

 resistance of the circuit = high;

}  

else if (direction of current flow = different)

{

 resistance of the circuit = low;

}

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