1. Flip Cards – Grade 9 Academic Science Question 1 The unit of measurement of resistance in an electrical circuit

2. Flip Cards – Grade 9 Academic Science Answer 1 Ohms Resistance is measured in units of ohms The symbol is Ω

3. Flip Cards – Grade 9 Academic Science Question 2 Two neutral materials are rubbed together to produce a static electrical charge by transferring or moving electrons from one of the materials to the other material.

4. Flip Cards – Grade 9 Academic Science Answer 2 Charging by Contact According to the Triboelectric Series, some materials tend to readily take electrons while other materials give electrons. If electrons are taken, the material has a negative imbalance (i.e., more negative electrons than positive protons) and the material becomes negatively charged.

5. Flip Cards – Grade 9 Academic Science Question 3 The formula for determining Percentage Energy Efficiency In a question, “What is the Percent Efficiency of an electrical fan is it uses 500 J of energy to produce 10 J of usable energy to turn the fan blades?”

6. Flip Cards – Grade 9 Academic Science Answer 3 % Efficiency = Energy Out / Energy In X 100 If the fan uses 500 J of energy, the term “uses” means the fan took that energy IN If the fan produces 10 J of energy, the term “produces” implies that it is the energy given off or OUT Thus, % Efficiency = 10 / 500 X 100

7. Flip Cards – Grade 9 Academic Science Question 4 An imbalance of electric charge on the surface of a material

8. Flip Cards – Grade 9 Academic Science Answer 4 Static Electricity

9. Flip Cards – Grade 9 Academic Science Question 5 Charging a neutral object by contact with a charged object

10. Flip Cards – Grade 9 Academic Science Answer 5 Charging by Conduction

11. Flip Cards – Grade 9 Academic Science Question 6 A material that lets electrons move through it easily

12. Flip Cards – Grade 9 Academic Science Answer 6 Conductor

13. Flip Cards – Grade 9 Academic Science Question 7 The energy provided by the flow of electrons in an electric circuit

14. Flip Cards – Grade 9 Academic Science Answer 7 Electrical Energy

15. Flip Cards – Grade 9 Academic Science Question 8 Like charges repel AND opposite charges attract

16. Flip Cards – Grade 9 Academic Science Answer 8 Law of Electric Charges

17. Flip Cards – Grade 9 Academic Science Question 9 Charging a neutral object by bringing another charged object close to but not touching the neutral object

18. Flip Cards – Grade 9 Academic Science Answer 9 Charging by Induction

19. Flip Cards – Grade 9 Academic Science Question 10 A material that does not easily allow the movement or passage of electrons through it

20. Flip Cards – Grade 9 Academic Science Answer 10 Insulator

21. Flip Cards – Grade 9 Academic Science Question 11 A circuit in which the loads are connected end-to-end so that there is only one path for electrons to flow

22. Flip Cards – Grade 9 Academic Science Answer 11 Series Circuit In a series circuit when one load is removed (e.g., light stops working), all loads stop working.

23. Flip Cards – Grade 9 Academic Science Question 12 Natural energy resource that is unlimited (e.g., solar energy, wind energy) or can be replenished by natural processes in a relatively short period of time.

24. Flip Cards – Grade 9 Academic Science Answer 12 Renewable Resource

25. Flip Cards – Grade 9 Academic Science Question 13 A device used to measure electrical current

26. Flip Cards – Grade 9 Academic Science Answer 13 Ammeter An ammeter is wired directly into the circuit as a series circuit. It measures the current flowing through a load.

27. Flip Cards – Grade 9 Academic Science Question 14 The difference in electric potential energy per unit charge measured at two different points and measured in volts (V)

28. Flip Cards – Grade 9 Academic Science Answer 14 Potential Difference or Voltage

29. Flip Cards – Grade 9 Academic Science Question 15 The transfer of electrons between two neutral objects (made of different materials) that occurs when they are rubbed together or come into contact

30. Flip Cards – Grade 9 Academic Science Answer 15 Charging by Friction

31. Flip Cards – Grade 9 Academic Science Question 16 The rate at which electrical energy is produced or used

32. Flip Cards – Grade 9 Academic Science Answer 16 Electrical Power

33. Flip Cards – Grade 9 Academic Science Question 17 A circuit in which the loads are connected by branches so that there are two or more paths for electrons to flow.

34. Flip Cards – Grade 9 Academic Science Answer 17 Parallel Circuit In a parallel circuit when one load is removed (e.g., light goes out), the other loads continue to work.

35. Flip Cards – Grade 9 Academic Science Question 18 The measurement of units of electrical current

36. Flip Cards – Grade 9 Academic Science Answer 18 Amps (A) Current (I) is measured as ampreses

37. Flip Cards – Grade 9 Academic Science Question 19 A device that reduces the flow of electric current.

38. Flip Cards – Grade 9 Academic Science Answer 19 Resistor A resistor could be a lamp, stove, computer, washing machine or electric can opener

39. Flip Cards – Grade 9 Academic Science Question 20 I = V / R The relationship between voltage, current and resistance

40. Flip Cards – Grade 9 Academic Science Answer 20 Ohm’s Law