Twenty Questions Animal Behaviors Twenty Questions 12345 678910 1112131415 1617181920.
Twenty Questions
-
Upload
melanie-rosales -
Category
Documents
-
view
29 -
download
0
description
Transcript of Twenty Questions
![Page 1: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/1.jpg)
Twenty Questions
Electricity 2
![Page 2: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/2.jpg)
Twenty Questions
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
![Page 3: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/3.jpg)
1. Give 1 advantage of using a circuit breaker.
• Reset instead of replaced.• Easier to see if it’s off.
![Page 4: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/4.jpg)
2. What type of appliance uses the greatest power?
• One which produces heat.
![Page 5: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/5.jpg)
3. Upon what does the size of an appliances flex depend?
• It’s power rating.
![Page 6: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/6.jpg)
4. In a house in what configuration are the wiring circuits? Why?
• Parallel.•So each appliance can be switched on/off separately.•Each appliance will have 230V across it.
![Page 7: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/7.jpg)
5. A heater has a current of 6A flowing through it for 4 minutes, what charge will pass through it.
•Q = It = 6 x (4 x 60) = 1440 C
![Page 8: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/8.jpg)
6. Draw the electrical field surrounding a negative point charge.
![Page 9: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/9.jpg)
7. State Ohm’s Law
• R = V ÷ I
![Page 10: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/10.jpg)
8. Draw the symbol for a fuse.
• Rectangle with the wire passing through it.
![Page 11: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/11.jpg)
9. Give an example each of a d.c. and an a.c. power source.
• d.c – battery• a.c - mains.
![Page 12: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/12.jpg)
10. If a heater uses 1500 J of energy each second, What current will it draw if it is working from the mains voltage?•V = 230V• P = 1500W as P = E / t •I = P ÷ V = 1500 ÷ 230 = 6.5 A
![Page 13: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/13.jpg)
11. Calculate the current in a circuit if 135 charges take 3minutes to travel through the circuit.
• Q = I t t = 3x60 =180s I = Q/t • I = 135/180 • I = 0.75A
![Page 14: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/14.jpg)
12. What are the values of the voltage and frequency of the mains supply?
•230V
•50Hz
![Page 15: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/15.jpg)
13. What is current?
•The flow of electric charges around a circuit.
![Page 16: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/16.jpg)
13. What is current?
•The flow of electric charges around a circuit.
![Page 17: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/17.jpg)
14. What are the units for charge?
• Coulombs
![Page 18: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/18.jpg)
15. What type of energy is gained when work is done moving a charge between two plates?
• Kinetic
![Page 19: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/19.jpg)
16. What danger is present when using a multiway adapter?
•If too many appliances are used or ones which require much current are used it may overheat and catch fire.
![Page 20: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/20.jpg)
17. Calculate the number of electrons that pass through a wire carrying a current of 2 A for 5 s. Qelectron = 1.6x10-19 C
• Q = It• = 2 x 5• = 10CNo. of electrons =10 ÷ 1.6x10-19
= 6.25 x 1019
![Page 21: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/21.jpg)
18. What type of current is shown by the waveform?
• a.c / alternating current
![Page 22: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/22.jpg)
19. Why must the fuse value be greater than the current used by the appliance?
• It melts when it’s rating/value has been reached
![Page 23: Twenty Questions](https://reader035.fdocuments.in/reader035/viewer/2022062314/5681313a550346895d97b015/html5/thumbnails/23.jpg)
20. What fuse would be used in a 2kW kettle?
• I=P/V• I=2000/230• I=8.7A• 13A fuse.