# Electrical principals and technologies review exam 2

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1. static charge
stationary, not moving electricity
2. different intereactions of static electricity
static cling is a + and a - attraction to one another. ex. + shirt attracted to - sock
3. what is lighting? what causes lighting between clouds?
• a huge jumo of electrons
• clouds with more electrons jump to clouds without as many electrons
4. pith ball experiment
5. when does chargerd separation occur?
When you bring a charged object near a nutral object
6. Is whater charged or nutral
nutral but contains both charges
7. how does a Van de Graff generator work?
use friction with rubber belt which carries electrons to the dome and when you touch it your hair goes everywhere and you become negitively charged
8. Protons
Neutrons
Electrons
• Protons - Positive, big, in nuecleus
• Electrons - negative, small, in shells that go around the nucleous
• Neutrons -  no charge, in neucleus, big
9. what is the purpose of some metal strips that hang off cars?
To dissapate any charge in the vehicle
10. Define what current electricity is and how it behaves. Know which untis are used to measure current, resistance, power, energy and voltage.
• Electricity that flows electrons through a complete path.
• Current - Amps
• Resistance - Omega
• Power - Watts
• Energy - joules
• Voltage - volts
11. Why would static electricity not be a good choice to power a stereo
It doesnt move and it wouldnt power everything
12. What series of steps take place to transfer power to your home?
Really big power lines to smaller power lines.
13. What is a load, switch, conductor, source, in a circut?
• Source - battery
• Conductor - wire
• swtich - turns on and off
• Load - anything that uses eletricity to work
14. Know the various types of load that a circut may have?
A light bulb
15. Be able to read off different meters:
Voltmeter
Milivoltmeter
Galvanometer
Ammeter
Ohmeter
• Ex. Milivolt -> volt -> kilivolt = 1000 -> 1 -> 0.001
• The larger the scale the smaller the number
16. How should a driver get out of a vehicle that has a high voltage power line touching itdue to an accident ?
Jump
17. Getting shocked depends on voltage and current? Understand insulators vs. conductors.
• Insulator - Resists the flow of electricity
• Conductor - Material that an electrical charge can move though easily
18. What is the purpose of a three pronged outlit?
• The third prong is to send out any excess electricty to the ground.
• The sender, resceiver, overload (sends to the ground)
19. What a 10A fuse be better replaced with a 15A fuse or a 5A fuse?
5A fuse because you want to use a fuse equal to or less than the original
20. Circut breakers vs. Fuses
• Circut breakers - Special wire thhat heats up and turns off switch when excess current flows through and electrical circut.
• Fuses - Thin peice of metal than melts to break an electrical circut when excess current flow occurs.
21. What is the purpose of a lighting rod?
gives an extra pathway to the ground
22. Where is the safest place to go in a lighting storm?
in the middle, away from tall things
23. be able to identify various types of enery
• Thermal: heat energy
• Electrical: electricity
• Mechanical: machines
• Solar/Light: light energy
24. be able to identify various types of energy conversions
oven- electrical -> thermal -> light
25. what are the basic parts of an electrochemical cell (battery)?
a package of chemicals that are designed to produce small amounts of electricity
26. What is a wet cell?
• uses liquid electrolytes that is usually an acid such as sulfuric acid
• ex. car battery
27. how to rechargable cells get recharged?
Reversed by using external electrical source to run electricity back through the cell
28. What is the difference between a cell and a battery?
• cell - individual, changes chemical energy into electrical
• Battery - set of cells conected together
29. What is the process of passing a current through something to separate it?
Electrolysis
30. How is electroplating accomplished? (whst ever you want plated has to be the *-* electrode!)
page 293
31. What is electrorefining? (The impure substance always has to be the *+* electrode!)
separate substances
32. How does a neon sign work? how are different colours created?
page 297?
33. How are the electrons different in conductors and insulators?
• Conductors -  free to move
• insulators - not
34. What makes a good conductor?
with no voltage, not tightly bound to the nuclei
35. why does the filament of a light bulb produce light?
305
36. What is a rheostat and how does it work?
???????????????
37. What makes water a good conductor?
38. How does the length and diameter of a wire affect the resistance of the current ?
• Long & skinny - longer time to pass
• Short and fat - less time
• Short and skinny - long time to pass
• Fat and long - shorter time
39. What does the temperature of a wire tell you about its conductivity and resistance?
???????????
40. What is the advantage of a multimeter
cheaper & easier to buy & use & to carry around etc
41. Understand ohms law and be able to do the various calculations ? What is the relationship that this law is based on?
306
42. What is schematic in regards to circuts?
43. Parallel vs. series circuts
• series : 1 swicth, 1 path
• Parallel : more switches , more paths
44. How are each of these circuts affected by switches , # of loads , etc.
45. Be able to look at the schematic of a circut and explain what will happen to the various loads and current.
46. what would a circut look like that has two switches to control one light bulb?
47. what device is used to make a light come on automatically at night?
48. What is energy?
Ability to do work
49. Different forms of energy and identifying energy conversions.
50. What unit is energy measured in?
joules
51. What unit is a thermococuple and how does it work?
52. How does the element of an oven heat up?
53. What did oersted discover? what made compass deflect?
54. Why does a compass deflect differently above and below a compass?
55. Know the left hand rule
56. How a ST. LOUIS MOTOR works and its 6 main parts?
57. How can you make an electromagnent stronger? (3 ways)
58. What makes an electric motor work?
59. What would make a motor turn in the opposite directions?
60. DC vs AC -  what are they and which one can be increased and decreased with transformers?
61. How can a generator affect the brightness of a light bulb
62. what does 6W and a 100W on a light bulb mean?
63. How many joules is one kWh equal to?
64. Be able to calculate power and engery
65. Be able to calculate the energy used in terms of kWh
66. What is efficency? Determine what appliance is more efficient
67. How does a furnance work in terms of efficiency ?
68. Be able to calcute effciency
useful output divided by useful imput x 100 = % efficiency
69. Why are electric motors more efficent then gas-powered engines?
70. What is the purpose of Energuide label?
71. How do you make an appliance that has a lot of friction more efficient?
72. Are heaters efficient compared to electric pumps, light bulbs and motors?
73. How is most energy produced around the world?
74. Why is crushed prior to burning it?
75. What is cogeneration ?
76. What is another name for biomass ? What is biomass?
77. How does a windmill and a hydro-electric dam work?

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 Author: aleahmurphy ID: 224310 Filename: Electrical principals and technologies review exam 2 Updated: 2013-06-19 00:26:10 Tags: science Folders: Description: science Show Answers:

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