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Electricity and Magnetism Review Match the definition in column II with its meaning when used in a circuit diagram in column I by writing the letter of the correct symbol in the blank on the left. Column I Column II ________ 1. negative a. rate at which electrical energy is changed to another energy form ________ 2. friction b. unit of electrical energy ________ 3. insulator c. charge on an electron ________ 4. voltage d. charge on a proton ________ 5. resistance e. process of transferring charge by rubbing of contact ________ 6. circuit breaker f. rearrangement of electrons on a neutral object caused by a nearby charged object g. circuit with only one path ________ 7. Power ________ 8. kilowatt-hour h. circuit with more than one path ________ 9. current i. doesn’t allow electrons to move through it easily ________ 10. parallel circuit j. tendency of a material to oppose the flow of electrons k. flow of electrons through a conductor L. related to the force that causes electric charges to flow M. piece of metal that bends when large current flows For the following short answer questions show all work, including equations, and write in complete sentences. 11. a) Someone pulls off their sweater and becomes negatively charged? What unbalanced charge remains on the sweater? Why would your hair cling to the sweater as it is pulled over your head? ________________________________________________________________________________ ________________________________________________________________________________ ________________________________________________________________________________ b) The person opens a door but gets a shock just before they touch it. Explain why using the following picture. ___________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ c) What does the following devise detect? If the person above had put their hand over the top (not touching) after pulling off their sweater, what would happen? Explain! ____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 12. Describe Ohm’s Law: 13. Determine the a) current flowing and b) power dissipated by the bulb in the circuit below. Work: c) If the light was left on for the weekend (2 days) how much would it cost the owner if the electrical utility company charges $0.10 per kW-hr Work: 14. The bulbs and batteries in the two circuits shown below are identical. B Y A X Circuit 1 Circuit 2 a) Which circuit above describes the most closely the way your home is wired? Explain your answer! Circuit _____ because _________________________________________________________________ ____________________________________________________________________________________ b) If a wire was attached between points A and B in circuit 2, would this change effect the brightness of each individual bulb in the circuit? If yes, explain in what way each bulb would be effected. Identify the two bulbs as X and Y (as shown). ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ c) Each light bulb in circuit 1 has a resistance of 8. The potential difference across the ends of the battery is 16V. Determine the current coming in and out of the battery. Work: Itotal = ___________ d) Determine i) the total resistance to the flow of charge and ii) the power dissipated in the circuit. Work: R total = ____________ Ptotal = ____________ 15. What is the cause of all magnetism? 16. N a) Draw the magnetic field around the bar magnet and the current carrying wire shown below. S I b) Show on the two diagrams above which way a compass needle would point above and below each object. 17. What happens if a wire is moved through a magnetic field (perpendicular to the field lines)? _______________________________________________________________________________ 18. Explain the operation of the electric generator (used in power stations). How does the operation of an electric motor differ from an electric generator? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________