Semi Conductor Physics : Types of semi conductor,Carrier Concentration,Density of holes in Valence Band,Combination of P-N Junction,Energy diagram of P-N Junction diode,Working of P-N Junction Diode,I-V Characteristics,Peak Inverse Voltage,Carrier genaration and recombination,Difference between Intrensic and Extrensc semi conductor,Conductivity of P-type Semi conductor,HALL Effect,Genor DIode,Function of Emmiter,Base and Collector,Principle of operation in case of Transistor Action.