1. Grade 9 Science – Unit 4 – Electricity #2 Series and Parallel Ohm’s LawResistance, Current and Voltage More R, V and I plus Power and Efficiency Producing Electricity 11111 22222 33333 44444 55555

2. A circuit with only one path

3. What is a Series Circuit?

4. It is the Voltage Load (V load ) across each load in a series circuit when the energy source is 60V and three loads occur on the circuit

5. What is 20V?

6. It is the Voltage Load (V load ) across each load in a parallel circuit when the energy source is 60V and three loads occur on the circuit

7. What is 60V? The voltage load is the same at each load as the energy source since each load in on its own path and receives the full energy from the source

8. When the energy source is connected to this type of circuit, the electrons have different paths to follow

9. What is a Parallel Circuit?

10. It is the voltage drop across each load in a series circuit when there are two loads for energy to cross

11. What is ½ the voltage drop across the energy source?

12. In Ohm’s Law, the type of relationship between voltage, current and resistance

13. What is Proportional Relationship?

14. The Ohm’s Law formula when solving for current

15. What is I = V / R?

16. If resistance is constant and voltage goes down, it happens to current

17. What is Current decrease or goes down proportional to the amount voltage decreased?

18. The voltage when a hair blower has a 24.0 Ω resistance and 5.00 A of current running through it when the blower is working

19. What is 120V? V = I * R V = 24.0 * 5.00 =120.0

20. The straight line relationship between voltage and current

21. What is Ohm’s Law?

22. A measure of the RATE of electron flow past a given point in a circuit

23. What is Electric Current?

24. 1.0A to 4.3A

25. What is the amount of current needed to stop the human heart from beating? Note: A wall outlet delivers 15A of power

26. The difference in electric potential energy per unit of charge measured at two different points in a circuit

27. What is Voltage or Potential Difference?

28. The ability of a material to oppose the flow of electric current

29. What is Resistance?

30. Length, Temperature, Type of Material and Cross-Sectional Area

31. What are factors that affect resistance?

32. The way a voltmeter is connected to a circuit to measure the potential difference across a load

33. What is Parallel?

34. The device that measures resistance

35. What is an Ohmmeter?

36. The rate at which electrical power is produced or used

37. What is Electrical Power?

38. Comparison of the energy output of a device with the energy supplied to the device

39. What is the efficiency of the device?

40. The percent efficiency of a light that uses 200 J of electrical energy and produces 50 J of light energy

41. What is 25%? % efficiency = E out / E in * 100 = 50 / 200 * 100 = 25 The light’s efficiency is 25%

42. Energy produced when water moves back and forth

43. What is Tidal Power?

44. Type of electrical energy produced when falling water turns a turbine

45. What is Hydro-Electric?

46. It is how coal, oil and gas are used to turn water into steam so the steam turns a turbine

47. What is burned?

48. Type of energy when thermal energy is moved from beneath the Earth’s surface and transferred into a liquid

49. What is Geothermal Energy?

50. The type of energy that uses the movement of air that is created by the natural processes of a convection current and the rotating of the Earth

51. What is wind?