Resistivity

Electrical Energy, Power & Resistance

Unit: Electrical Energy, Power & Resistance Number of lessons: 6 This bundle includes all six lessons in my unit Electrical Energy, Power & Resistance. It is specifically linked to the OCR Physics A Specification, but should apply to most A Level Physics courses. The lessons cover the following points: 1. Energy transfers within a circuit 2. Definitions of e.m.f. and p.d. 3. Equations for p.d. 4. Base units of the volt 5. Definition of electrical resistance 6. Base units of the ohm 7. Practical to determine resistance of a coil 8. Ohm’s law 9. Determining resistance from an I-V graph 10. I-V characteristics of resistors, lamps, diodes and thermistors 11. Demonstration of how resistance changes with temperature 12. Explanation of the I-V curve for filament lamps 13. Practical to investigate NTC thermistors 14. Uses of LDRs 15. Practical to investigate LDRs 16. Explanation of resistance curve for LDRs 17. Practical to look at factors that affect resistance 18. Derivation of equation for resistivity 19. Practical to determine resistivity 20. Comparing resistivities of metals, semiconductors and insulators 21. How resistivity changes with temperature 22. Graphical analysis to determine resistance 23. Definitions and equations for power 24. Exam-style questions 25. Loads of questions and problems There are detailed teacher notes in the ‘Notes’ section of each slide, including answers where required. My first unit of electricity lessons (Electricity, Charge & Current) is available free of charge for you to see the style I employ.