1. Solve for Z ABCDE HKMNP STVX WYZ =

2. Chapter 22 Current Electricity

3. Electric Current The flow of charged particles

4. Circuit Closed loop through which charged particles flow

5. Voltaic Cell Converts chemical energy into electrical energy

6. Battery Several cells connected together

7. Photovoltaic Cell Changes light energy to electrical energy

8. Charge Pump Increases potential energy of the charges

9. Charge Pumps Batteries, generators, voltaic cells

10. Electricity Units Watt (W) = J/s Ampere (A) = C/s Resistance (R) = V/C Voltage (V) = J/C

11. Current (I) Electric flow in coulombs per second

12. Conventional Current The flow of positive charges

13. Electric Power Product of potential difference & current

14. Power (P) P = VI

15. Resistance (R) Ratio of potential drop to current flow

16. Resistance (R) unit = ohm (  )

17. Resistance (R) R = V I

18. Rearranged V = IR

19. Resistor A device designed to have a specific resistance

20. Resistor Made of thin wires, graphite, semiconductors, etc

21. Resistors Light bulb, toaster, etc

22. Current can be changed by varying either voltage or resistance

23. Potentiometer Variable resistor rheostat

24. Schematic Diagram of electric symbols for components in a circuit

25. Electric Symbols On page 454

26. Conductor

27. Switch

28. Fuse

29. Capacitor

30. Resistor (fixed)

31. Potentiometer

32. Ground

33. Battery

34. Lamp

35. Voltmeter V Measures Potential Difference or volts

36. Voltmeter V Must be connected in parallel with circuit

37. Ammeter A Measures current or amps

38. Ammeter A Must be connected in series with the circuit

39. DC Generator

40. Electric Connection

41. No Electric Connection

42. When a capacitor is charged through a resistor, the current is high, but falls quickly

43. Power dissipated (used up) in a resistor is proportional to the resistance

44. Power dissipated in a resistor is proportional to the current squared

45. Power Formula P = I 2 R

46. The total electrical energy transferred equals the power times the time

47. Energy Formula E = I 2 Rt

48. Energy Energy = power x time is measured in kilowatt hours

49. FormulasFormulas P = VI V = IR P = I 2 R E = I 2 Rt

50. A current of 0.50 A passes through a 120 V outlet for 5.0 minutes: Calculate: P, R, & E

51. A 60.0 W light is connected to a 120 V outlet for 2.5 hours: Calculate: I, R, & E

52. Headlights burn for 7.5 hrs with a resistance of 48  in a 12 V system Calculate: I, P, & E