11. E = Pt. b) 0.7 of P is converted to rate of heat absorbed by the brass mc@/t.
12. The SCon current increases significantly when the V increases hence the curve turns steeper towards the higher V. Increase heating leads to more electrons -hole pair as electrons jump into CB leaving holes in VB.
13. Find Vx at LDR= 1000ohms and then at 100 ohms . The values should be 10V and then 25V. It is increase of 15 V. Take Vx when bright- Vx when dark. b) The voltmeter reading is (30 - Vx') which is 5V.
