1. Mid year Review

2. Exam Breakdown Part 1 Part 2 Bonus 32 Multiple Choice 4 pts each
14 Short answer
Technological analysis
Bonus

3. 2 hour exam Tech world: 11 questions Changes 4 Magnetism 4 Solenoids 4
Electricity
Static 4
Dynamic 3
Circuits 6
Formulas 9

4. Technological World (11)
Motion transformation and transmission systems
Speed change based on Torque and gear size
Links and Guides
Constraints and Properties
Multiview drawing
Tolerances
Increase friction and adhesion of a surface
How does an object work

5. Changes

6. Changes (4) Combustion Oxidation Visible signs of rapid combustion
Fire triangle
Oxidation
Identify an Oxidation reaction

7. Types of chemical changes
Oxidation:
Definition:
Chemical change that occurs when a substance reacts with oxygen (O2)
Examples
Rusting
An apple turning brown
Particle Model

8. Types of chemical changes
Combustion:
Type of oxidation reaction that releases a large amount of energy (light and heat)
Examples
Fire
Fire Triangle

9. Combustion Triangle
Fuel
Oxidation
Agent
Ignition
Temperature

10. Combustion types:
Slow
Rapid
Spontaneous

11. Static Electricity (4) Elementary particles and their charge
How charged particles react while close to one another
Bonus Question

12. Elementary particles Protons Positive Electrons Negative
Neutrons Neutral

13. What does this mean…
An element with more electrons than protons will be considered negatively charged
A substance with less electrons than protons will be considered positively charged

14. How do charges react?
Opposites attract, Like charges repel

15. Practice Questions

16. Practice Questions
If I say that by rubbing silk and glass together, the silk gains electrons.
Will silk be positively or negatively charged?

17. Dynamic Electricity (3)
Conductive vs. non-conductive
Changes in conductivity of a wire

18. Dynamic electricity

19. What conducts electricity?
Metals
Graphite
Electrolytes (salts in water)

20. Conductivity of a wire
A wire’s conductivity (how much electricity can pass through in a given time) will
Increase if the diameter of the wire increases
Increases if the length of the wire decreases
Increases if the temperature decreases
Change with substance used (copper is the best)

21. Which of the following
plastic

22. Circuits

23. Circuits (6) Electrical functions Series vs. parallel circuits
Draw a circuit
Connection of an ammeter and voltmeter
Identify the circuit based on description

24. Circuitry basics
All circuits must have elements that perform the following electrical functions
Power supply: Battery
Conductors: Wires
Transform energy: Resistors, Lights
To that you can add
Control Switch
Protection Fuse

25. Circuitry Basics Parallel Series More than 1 pathway Independent
Lights controlled separately
More energy efficient
Series
Only 1 pathway
Dependant: 1 goes out they all do
1 switch controls everything
Less energy efficient

26. Drawing a circuit Read the question carefully
Find out whether they are asking for a series or parallel circuit
Draw the circuit (1, 2 or 3 boxes)
Add the power supply
Add and label the necessary components

27. Adding Ammeter and Voltmeter
An Ammeter
Measures current intensity
Placed directly in the circuit
A voltmeter
Measures potential difference
Measures 2 points

28. Questions on Circuits
A circuit consists of two light bulbs (L1 and L2), a switch, and a power supply. When switch 1 is open L1 stays on and L2 goes out. Close the switch and both lights are on.
Draw the circuit

31. What are the electrical functions found in the following circuit?

32. Formulas

33. Formulas (9) Basic Applications Dual Equations
V=RI
E=Pt
P=VI
Qualitative V=RI
Dual Equations
Find the most energy efficient appliance (calculate E)

34. To solve Read the question carefully
Underline the important information and highlight what is being asked of you (what should your final answer be)
Find the formula that has your missing variable in it.
Identify the remaining relevant information in your question. (If you are missing a second variable you need a second formula)
Solve the problem
Do not forget to include your units

35. Calculate the resistance value for each of the following resistors
A 2 V 10 A
B 5 V 3A
C 3 V 20A
D 6 V 2A

36. Question
While having breakfast, you notice the following information on the specification plate of the toaster.
You also note that this toaster toasts the bread in 1.5 minutes. What quantity of electrical energy is consumed by the toaster's element to toast the bread?

37. Magnetism (4)
Identify the magnetic, non-magnetic and ferro-magnetic substance
Magnetic field lines and respective pole
Compass over a live wire

38. Definitions Magnetic: Ferro-magnetic: Non-magnetic
Object that can attract objects containing iron, nickel or cobalt
Ferro-magnetic:
Object that contains iron, cobalt and nickel, that will be attracted by a magnet
Non-magnetic
Object that is not attracted or repelled by a magnet

39. Magnetic Field Lines Always go from N to S Out of the North pole
Into the South pole

40. Live wire magnetic fields
Right-hand rule
Thumbs points to the negative terminal
Fingers indicate direction of magnetic field
*** If compass placed on wire
- Thumb points to the negative terminal
- Your pointed index will indicate the North of the compass

41. Questions

43. Repel or attract and why?
Iron
Plastic

45. Solenoids

46. Solenoids (4) Magnetic field of a solenoid
Factors influencing solenoids
Attraction and repulsion of electromagnets

47. A solenoid is a live wire that has been coiled
The magnetic field is controlled by the power supply
To find the north
Your fingers follow the coil towards the negative terminal
Your thumb points North

48. You can increase the strength of a solenoid by…
Increasing the number of coils
Increasing the current flowing through the coil
Changing the core (what the coil is wrapped around) to something containing iron

49. Questions