Okaaay, HELLO PEOPLE! (:
As we are finishing the chapter, we got a new assessment:
WRITE A BLOGPOST EXPLAINING THE GOALS FROM 9 TO 21!
This chapter was quite difficult for me, but I will try my best to explain them! (;So, here we gooooo! :D
EM9. I can describe the properties and interactions of magnets.
First, the definition of MAGNETS: magnet is any material that attracts iron and materials that contain iron and other materials. Also, they are not new things! They existed even more than 2000 years ago. People living in the ancient Greet city of Magnesia, which is Turkey these days, found an unusual kind of rock! and the rock contained a mineral called magnetite. As you can see, the word 'magnetite' and 'magnet' are both from the name 'Magnesia'.
Here are some properties of Magnet.
1. Magnets attract iron and materials that contain iron.
2. Magnets attract or repel other magnets.
3. One part of a magnet will always point north when allowed to swing freely.
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| Properties of magnets #1 |
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| Properties of magnets #2 |
And further explain for property #2, Magnetic poles that are unlike attract each other, and magnetic poles that are alike repel each other.
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| Properties of magnets #3 |
EM10. I can describe how the magnetic domains are arranged in a magnetic/non-magnetic material.
So, what is 'Magnetic Domain'? Is is a grouping of atoms that have their magnetic fields aligned. Also, the domain acts like a bar magnet with a north and south pole.
However, the direction in which the domains point determines if the material is magnetized or not magnetized. Okay, this picture will help you with understanding.
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| *Magnetized : pointing the same direction *Not magnetized: pointing random directions |
In other words, we can say that the magnetic fields of the domains are aligned!
EM11. I can explain the connection between electricity and magnetism (electromagnetism).
Okay! now the connection between electricity and magnetism! which is......... ELECTROMAGNETISM!
electromagnetism is the relationship between electricity and magnetism.
hmm, hard to understand? then lets say, 'wherever there is electricity, there is magnetism.' An electric current produces a magnetic field! (:
EM12. I can outline the difference between DC/AC current and its uses
Now, what is DC and AC? hmm well, DC is Direct Current, and AC is Alternating Current.
so, what's the difference between two of them?
The charges may move (or flow) in one direction only, or they may alternate directions in an induced current. The direction depends on direction of wire or magnets moving.
DC (Direct current): charges that flow in one direction only
AC (Alternating current): charges that move back and forth, can be easily raised or lowed.
EM13. I can explain why the Earth behaves like a magnet and the consequences of it.
The Earth has a magnetic field surrounding it and two magnetic poles, just like a bar magnet.
and this explains why a compass works! (: compass is a device that has a magnetized needle that spins freely. The needle of compass usually points north. The earth has magnetic properties, and they are important to some animals, because some animals, like birds and turtles can feel the earth's magnetic field, being contributed in their navigation during the migration.
EM14. I can explain the importance of grounding wires and using fuses/circuit breakers.
The grounding wires are very important for our safety, because they actually keep the electricity from the actual wire so we don't get shocked. They block the way of electricity so the electricity can't reach to our hands. Also, the fuses and circuit breakers do the same thing, helping us to use electricity safely, like blocking the electricity when the amount of it goes too high.
EM15. I can explain how an electromagnet works and cite applications for them.
An electromagnet is A magnet, but it is different from other magnets because it is caused by electricity. If there is a conductor, and the electric current produces the magnetic field which makes the conductor having a magnetic properties. And the examples of the electromagnet is a lifting magnet, which makes our life easier because we can lift super heavy metal without much force, and also the train that flies with magnetism.
EM16. I can explain how a simple motor works (parts and function).
There are some names of the part of the simple motor, and here are the explanation about how they works. (:
First, the electrons from the negative side of the battery, (we can also say that it's voltage source) come out and flow split ring commutator, and then go through the armature, follows the armature and come out from the other side of the commutator, and go back in to the battery.
The armature, which is going to rotate and move since the commutator is attatched to the battery, and the electrons have the flow, so which will try to align to the magnet.
EM17. I can describe how a generator and a transformer work.
An electric generator, which is a divice that transforms mechanical energy to electrical energy. And there are AC generator, and DC generator, but there are no big difference exept that AC generator has the slip ring, instead of commutator. Also, in a generator, the armature rotates when a current in induced. The current leaves the generator through the brushes, and the crank is used to rotate the armature. Finally, the split ring is attached to the ends of the armature.EM18. I can explain the importance of transformers to power grids.
Before explaining this goal, there is a formula that we have to know, which is 'Power = Voltage x Current' , and this formula explains us that the current to be sent efficiently the voltage has to be very high because the lower the current is the less energy lost because when the current increases the temperature also increases.EM19. I can explain methods of power production and distribution.
Power distribution and production comes in many ways, power plants, wind energy, water, steam, fossil fuels and solar energy and etc. The energy that comes to our homes comes from a generator that generates power, and the way it generates power is that it usually has a turbine that rotates and makes the generator work, the way this turbine turns is or by burns something, or weather, or wind, or steam. When the turbine rotates the generator works and transforms mechanical energy into electrical energy.EM20. I can describe the differences of 110v/220v and main advantages and disadvantages of each.
The disadvantages of the 110v is that we need more current because we decreased the voltage, which means that we need more conductor. However, the advantage of the 220v is that we don't need to use bunch of conductors because we already have high voltage and the current is decreased.
EM21. I can describe the advantages and disadvantages of electrical energy.
Electric energy is green, and clean so we don't pollute and it's very fast. However the disadvantage of the electric energy is that it's not safe because it might cause a fire because of using it too much, or a shock, which might cause death.
