Elektrosztatika kísérletek

1. Phet feladat Ballonos kísérlet (Angol gyakorló, válaszok lehetnekmagyarul. de angolul több pontot érnek)


What type of charge was transferred from the sweater to the balloon?
What type of charge did the sweater have at the beginning of the experiment?

Play with the simulation and observe what happens when the balloon is rubbed on the sweater.  Explain why this happens. 

What type of charge did the sweater have at the end of the experiment?

Why don’t all the positive charges move toward the balloon?

Bring your charged balloon near the wall and describe what happens to the wall.  Explain why this happens.

What happens to the positive charges in the wall when you move the balloon near it?

Now, take your charged balloon and place it somewhere between the wall and the sweater.  Observe what happens, and describe it here.  Explain why this happens! 

Hold the balloon in between the wall and shirt and release it.    Why doesn’t the balloon just stay in the middle?

When charging an object by friction,
a.    only the positive charges move from one object to the other.
b.    only the negative charges move from one object to the other.
c.    both the positive and negative charges move from one object to the other.
d.    neither the positive nor the negative charges move from one object to the other.




When an object becomes polarized,
a.    only the positive charges move within the object.
b.    only the negative charges move within the object.
c.    both the positive and negative charges move within the object.
d.    neither the positive nor the negative charges move within the object.


Based upon what you saw in this lab, then, it can be said that
a.    positive charges are stationary within objects.
b.    negative charges are stationary within objects.
c.    positive charges are mobile within objects.
d.    negative charges are mobile within objects.
e.    both a and b
f.    both a and d
g.    both b and c
h.    both c and d

charge - töltés
stationary - nem mozdulnak el
sweater -pulcsi
to rub - dörzsöl
to observ - megfigyel
to release - elenged
shock - szikra
conductor - vezető
insulator- szigetelő
knob- kilincs

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2. Phet feladat John Travoltage kísérlet (Angol gyakorló, válaszok lehetnekmagyarul. de angolul több pontot érnek)

Rub John Travoltage’s foot on the carpet and observe what happens.  What is this called? 

Watch after you stopped rubbing John Travoltage’s foot on the carpet, what happened to the charges in his body? 

Now, touch John Travoltage’s hand to the door knob.  Observe what happens.  Explain why this happens.

Now try building up charge while his finger is on the door. What happens?

Why are shocks worse when you touch conductors rather than insulators?

If you take your hat off on a dry winter day, sometimes your hair will stand up.  Explain this phenomenon.

 Over time, all the negative charges in an object,
a.    remain clustered together where they were placed.
b.    spread out over a small area on the object.
c.    spread out over a large area on the object.

When a charged object touches a conductor,
a.    the positive charges move to the conductor and exit the object.
b.    the negative charges move to the conductor and exit the object.
c.    both the positive and negative charges move to the conductor and exit the object.
d.    neither the positive nor the negative charges move to the conductor and exit the object.

 Based upon what you saw in this lab, then, it can be said that
a.    a person cannot be shocked if they have an excess charge on them.
b.    a person cannot be shocked if they have neutral charge.
c.    a person can be shocked at any time because it doesn’t depend on the charge the person has.



charge - töltés
stationary - nem mozdulnak el
sweater -pulcsi
to rub - dörzsöl
to observ - megfigyel
to release - elenged
shock - szikra
conductor - vezető
insulator- szigetelő
knob- kilincs---------------------------------------------------------------------------------------------------
3. Phet feladat, Elektromos hoki kísérlet (Angol gyakorló, válaszok lehetnekmagyarul. de angolul több pontot érnek)

The goal of this game is to get the black positive puck to go in the goal. How can you set up just one negative charge to score a goal?

Clear each time you try a new set up.How can you set up just one positive charge to score a goal?

Change the mass and see what happens. What happens when the mass is lighter? Why does the mass affect the speed if it is not apart of the electric force equation?

Set up a triangle of charges, with two positives and one negative.  Draw the field lines for this set up.

Set difficulty to 1, then 2, then 3.  When you beat each level, draw your set up, and show me. 

Legkevesebb részecske felrakásával hogyan tudnád a kapuba tenni a képen látható pozitív részecskét.
Eredményt rajzold le.










puck  -korong
triangle- háromszög
field line- erővonal

Modern physic

Presentation

Criterias for the presentation

1. understandable, not too easy and not too difficult
2. you have to speak slowly so that the others can take notes
3. 10-20 new words but not more (tell the meaning of the new words)
4. 20 minutes presentation 
5. 5 minutes quize for the audience 
6. 5 minutes for questions
7. good pictures
8. 1 or max 2 short videos
9. good PP presentation (short text, readable)

Fo each criteria you can get 3 point.

27-23 | 22-18 | 17-13 |  12-8 | 7-0

You have to send me your presentation in email before the lesson.

Topics

1.  Röntgen (FA)
2. Bequerel  (HA)
3. Marie and Pierre Curie (SI)
4. J J Thomson ()
5. Hans Wilhelm Geiger
6. Rutherford ()
7. Max Plank
8. Einstein (HB)
9. Niels Bohr (BJ)
10. Louis de Broglie,Clinton Davisson and George Thomson
11. Heisenberg ()
12. Enrico Fermi ()
13. Neumann János, Szilárd Leo,  Wigner Jenő (HR)
14. Discovery of atomic bomb, Manhattan project (HP)
15. Nuclear power station
16. Csernobil
17. Teller Ede hidrogén bomba (SP)
18. Murray Gell-Mann, quark theory ()
19. Richard Feymann
20. Particle zoo, antimatter
21. CERN
22. Peter Higgs
23. Standard modell
24. Relativity theory

Top Skills and Values Employers Seek

1. Strong Work Ethic Are you motivated and dedicated to getting the job done, no matter what?

2. Positive Attitude Are you optimistic and upbeat?

3. Good Communication Skills Are you both verbally articulate and a good listener?

4. Time Management Abilities Do you know how to prioritize tasks and work on a number of different projects at once?

5. Problem-Solving Skills Are you resourceful and able to creatively solve problems that will inevitably arise?

6. Acting as a Team Player Will you work well in groups and teams?

7. Self-Confidence Do you truly believe you can do the job?

9. Flexibility/Adaptability Are you able to adapt to new situations and challenges?

10. Working Well Under Pressure Can you handle the stress that accompanies deadlines and crises?

11. Leadership/Management Skills

12. Honesty/Integrity/Morality

13. Dependability/Reliability/Responsibility

14. Willingness to Learn

15. Computer/Technical Literacy

16. Multicultural Sensitivity/Awareness 

17. Respecting the rules

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The competencies or transferable skills that are particularly popular with graduate recruiters include:

• communication - ability to communicate orally, in writing, or via electronic means, in a manner appropriate to the audience;
• teamwork - being a constructive team member, contributing practically to the success of the team;
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• initiative - ability to see opportunities and to set and achieve goals;
• problem solving - thinking things through in a logical way in order to determine key issues, often also including creative thinking;
• flexibility/adaptability - ability to handle change and adapt to new situations;
• self-awareness - knowing your strengths and skills and having the confidence to put these across;
• commitment/motivation - having energy and enthusiasm in pursuing projects;
• interpersonal skills - ability to relate well to others and to establish good working relationships;
• numeracy - competence and understanding of numerical data, statistics and graphs.

     
 

Electricity test 12/A

Date of the test 3rd of February

1. Short history of electricity


Greek scientist, rubbing amber ήλεκτρον (electron) attracts small objects

Benjamin Franklin  In June 1752 he is reputed to have attached a metal key to the bottom of a dampened kite string and flown the kite in a storm-threatened sky. A succession of sparks jumping from the key to the back of his hand showed that lightning was indeed electrical in nature. In June 1752 he is reputed to have attached a metal key to the bottom of a dampened kite string and flown the kite in a storm-threatened sky. A succession of sparks jumping from the key to the back of his hand showed that lightning was indeed electrical in nature.

In 1791, Luigi Galvani published his discovery of bioelectricity, demonstrating that electricity was the medium by which nerve cells passed signals to the muscles. Alessandro Volta's battery,  of 1800, made from alternating layers of zinc and copper, provided scientists with a more reliable source of electrical energy than the electrostatic machines previously used.

Electromagnetism

On 21 April 1820, during a lecture, Ørsted noticed a compass needle deflected from magnetic north when an electric current from a battery was switched on and off, confirming a direct relationship between electricity and magnetism.

  Michael Faraday invented the electric motor in 1821.

In 1821, soon after the Danish physicist and chemist Hans Christian Ørsted discovered the phenomenon of electromagnetism.

Electromagnetism manifests as both electric fields and magnetic fields. Both fields are simply different aspects of electromagnetism, and hence are intrinsically related. Thus, a changing electric field generates a magnetic field; conversely a changing magnetic field generates an electric field.


 2. Phet simulation


http://phet.colorado.edu/en/simulation/faradays-law
http://phet.colorado.edu/en/simulation/faraday
http://phet.colorado.edu/en/simulation/generator (important)
http://phet.colorado.edu/en/simulation/magnets-and-electromagnets
http://phet.colorado.edu/en/simulation/circuit-construction-kit-dc (important)


Basic questions:


Build a circuit. One lamp, battery and a switch. What will be the current if the voltage of the battery is 15 V and the resistance of the bulb is 10 Ohm.


What happens if you increase the turns of the first or second coils in transformer?


Explain how does the generator work with the generator simulation?


What is the diffrences between bar and electromagnet? Explain it with the simulations.




3. BBC Bitesize 


You have to know the test.


Electric current and voltage

Video: http://www.bbc.co.uk/schools/ks3bitesize/science/energy_electricity_forces/electric_current_voltage/activity.shtml


Test: http://www.bbc.co.uk/apps/ifl/schools/ks3bitesize/science/quizengine?quiz=electricity&templateStyle=science


Magnets and electric current

Video: http://www.bbc.co.uk/schools/ks3bitesize/science/energy_electricity_forces/magnets_electric_effects/activity.shtml

Test: http://www.bbc.co.uk/apps/ifl/schools/ks3bitesize/science/quizengine?quiz=magnetism&templateStyle=science

 4. Your presentations


Electromagnets
Generator
Magnets (Earth magnetism)
Electric motor
Transformer


You have to know the basic things about them.


What is it?
How does it work?
What can be used for?

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What was Benjamin Franklin's  famous experiment?

Stromy weather, used a kite, key started to sparkle, proved that electricity in the cloud is the same as the electricity on earth
discovered that there are two types of charges


What did the Danish scientist Oersted discover?

if current flows in a wire it causes magnetic filed around the wire, 

How can you produce electricity? Write down 3 different methods.

1. rubbing
2. two diffrent metal in a special liquid, Volta battery
3. generator, magnet spins in a coil (Faraday)

What was the discovery of Faraday which revolutionized the technology?


electrical motor, generator

2. Which of the following is not a magnetic material?

steel
cobalt
aluminium

3. What do two poles of the same type do when they are brought close together?

they attract
they repel
they make an electric current flow

6. Where are the field lines most concentrated around a bar magnet?

at both poles
in the middle
at the north pole only

7. How can we increase the strength of an electromagnet?

add an iron core
reduce the number of turns on the coil
reduce the current in the coil

8. What is one difference between electromagnets and bar magnets?

Bar magnets can be turned off but electromagnets cannot.
Bar magnets have a magnetic field but electromagnets do not.
Electromagnets need electricity but bar magnets do not.

9. What can we use to find the shape of a magnetic field?

an electromagnet
a coil of wire
a compass

10. What two gases are produced from electrolysis of water?

magnesium and hydrogen
hydrogen and oxygen
oxygen and magnesium

11. What is NOT true about energy saving light bulbs?

they use less energy than normal bulbs
they transfer less of their energy into heat
they are brighter than normal bulbs

1. What needs to be done to this circuit so that the lamp lights up?

close the switch
add another lamp
add a cell and close the switch

2. What component does this circuit symbol represent?

cell
buzzer
capacitor

3. Which switch or switches must be closed to make the lamps light?

only switch 1
only switch 2
switches 1 and 2

4. If lamp 1 is unscrewed from its holder, what will happen to lamp 2?

it will get brighter
it will go out
it will stay the same brightness

5. If lamp 1 is unscrewed from its holder, what will happen to lamp 2?

it will stay lit
it will go out
it will get dimmer

6. What is wrong with this circuit diagram?

there is only one cell
the ammeter should be connected in series
a ammeter should be connected in parallel

7. Which ammeter will have the biggest reading?

ammeter 1
ammeter 2
they will read the same

8. Which statement about electric current is correct?

it always flows clockwise
it gets used up as it goes around the circuit
it does not get used up as it goes around the circuit

 
1. Build a circuit. One lamp, battery and a switch. What will be the current if the voltage of the battery is 15 V and the resistance of the bulb is 10 Ohm.


2. What happens if you increase the turns of the first or second coils in transformer?

 If you increase the number of turns the voltage will be bigger and if you decrease the voltage will be smaller

4. Explain how does the generator work with the generator simulation?

 something (water, steam)turns around a magnet and the spinning magnet induces AC current in a coil


5. What is the diffrences between bar and electromagnet? Explain it with the simulations.

you need electricity and you can switch off or on


Electromagnets
Generator
Electric motor
Transformer


What is it?
How does it work?
What can be used for?