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Unit 4: Electrical Principles and Technologies 1. What would happen between the following combinations of atoms? a. + and + atoms_____________________________________________________ b. - and – atoms______________________________________________________ c. + and – atoms______________________________________________________ d. N and +atoms______________________________________________________ e. N and - atoms______________________________________________________ 2. Explain the difference between static electricity and current electricity. ______________________________________________________________________________ _____________________________________________________________________________ 3. What is voltage? ______________________________________________________________________________ ______________________________________________________________________________ 4. How is electrical energy produced from chemicals? ______________________________________________________________________________ ______________________________________________________________________________ 5. Describe the differences between a ‘dry cell’ and a ‘wet cell’. ______________________________________________________________________________ ______________________________________________________________________________ 6. How does an electrochemical cell work? ______________________________________________________________________________ ______________________________________________________________________________ 7. What is a conductor? ______________________________________________________________________________ ______________________________________________________________________________ 8. What is an insulator? ______________________________________________________________________________ ______________________________________________________________________________ 9. What is resistance? ______________________________________________________________________________ ______________________________________________________________________________ 10. What is current? ______________________________________________________________________________ ______________________________________________________________________________ 11. What is Ohm’s Law? ______________________________________________________________________________ ______________________________________________________________________________ 12. What units are resistance, voltage and current measured in, and what devices are used to measure them? ______________________________________________________________________________ ______________________________________________________________________________ 13. What is the difference between a series circuit and a parallel circuit? Know how to draw circuits and recognize errors in circuit drawings. ______________________________________________________________________________ ______________________________________________________________________________ 14. Identify or illustrate the electrical circuit component or symbol in the table. 15. How is thermal energy transformed into electrical energy? ______________________________________________________________________________ ______________________________________________________________________________ 16. How is electrical energy transformed into mechanical energy? ______________________________________________________________________________ ______________________________________________________________________________ 17. What is power and how is it calculated? ______________________________________________________________________________ ______________________________________________________________________________ 18. What is energy and how is it calculated? What are the units of energy? ______________________________________________________________________________ ______________________________________________________________________________ 19. What are the main parts of a motor and what are their functions? ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ 20. How can efficiency be calculated? ______________________________________________________________________________ ______________________________________________________________________________ 21. How can efficiency be improved? ______________________________________________________________________________ ______________________________________________________________________________ 22. Describe alternative sources of energy. a. Fossil fuels – _____________________________________________________________ ________________________________________________________________________ b. _____________ - _________________________________________________________ ________________________________________________________________________ c. _____________ - _________________________________________________________ ________________________________________________________________________ d. _____________ - _________________________________________________________ ________________________________________________________________________ e. _____________- _________________________________________________________ ________________________________________________________________________ 23. What is the difference between renewable and non-renewable energy sources?
