Resistance is obstacle in path of current. More will be the resistance & Lesser will be value of current. It depends on dimensions of conductor. It is directly proportional to length of conductor & inversely proportional to Area of cross section.
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This topic is from current electricity. Current electricity is 3rd chapter of class 12 Physics. You can check handwritten notes of current electricity.
Firstly understand Concepts of all topics for this you can read ” Class 12 Physics Handwritten Notes “& Important Questions for Numerical Practice. You can check ” Class 12 Physics Important Questions “.
You can also check “NCERT SOLUTION CLASS 12 PHYSICS”.
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