Name __________________________________________ Date ________________________________ Physical Science Block _______ Unit 4: Electricity & Magnetism Test Study Guide Directions: Identify each of the following as a conductor or an insulator by writing an “I” or “C” in the blank. ____1. metal doorknob _____ 6. rubber ____2. carpet _____ 7. plastic ____3. silver _____ 8. paper clip ____4. gold _____ 9. copper ____5. wood _____ 10. metal coat hanger Directions: Describe how each of the following pairs of charges will react: 11. positive and positive 12. positive and negative 13. negative and negative _____________________________ _______________________ MATCHING - Word Bank circuit series attract direct electrons alternating 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. ______________________________ opposite volts circuit breaker parallel positively fuse negatively current Static repel like A _______________ circuit has only one path for electricity to follow. The flow of electrical charges from one point to another is called electric _______________. A ____________ and a _____________ are safety devices that stop the flow of electric currents. In both electricity and magnetism, ____________________ charges attract. A _____________________ circuit has more than one path for electricity to follow. An electron is _________________________ charged. In both electricity and magnetism, _______________________ charges repel. A single bolt of lightning carries 100 million ________________ of electricity. __________________ electricity occurs when electrical charges build up on an object. Static electricity occurs when items lose or gain ___________________. A proton is ________________________ charged. Two objects with equal numbers of electrons at their surface will _________ each other. A(n) ________________ current circuit has current that flows in one direction (ex. batteries). A(n) _________________ current circuit has current that flows changes direction -in the U.S. 60 times each second. (ex. electric outlets) 28. Draw a parallel circuit that includes a battery, three light bulbs, and wire. Label the flow of electrons & current. 29. Draw a series circuit that includes a battery, three light bulbs, and wire. Label the flow of electrons & current. 30. What current flows through a 12 volt circuit in a car that has speakers with a resistance of 8 ohms? 31. What is the voltage in a circuit where a toaster that draws 1.2 Amp of current has 100 ohms of resistance? 32. How much resistance does an LED bulb in a 4.5 volt flashlight provide if it draws .05 amps of current?