1. READ AND DOWNLOAD PDF FILE OF TOPIC(SEMICONDUCTORS):http://freestudy.co.uk/c103/t19.pdf
  2. READ AND DOWNLOAD PDF FILE OF TOPIC(ALTERNATING CURRENT):http://freestudy.co.uk/c103/t18.pdf
  3. READ AND DOWNLOAD PDF FILE OF TOPIC(TRIGONOMETRICAL GRAPHS):http://freestudy.co.uk/ncmaths+2007/outcome3t1.pdf