| Resource | Focus Area | Best For | | :--- | :--- | :--- | | | Numerical problems & Anna Univ syllabus | Tamil Nadu students & GATE | | Badri Ram & Vishwakarma | Deep theoretical concepts | IES/ESE conceptual clarity | | Y.G. Paithankar | Transformer & motor protection | Industry professionals | | Sunil S. Rao | Switchgear (Breakers) | High voltage engineering |