In second semester, our science class began with completely different topic, the Electricity.
We use Electricity in our daily life. In fact, 90% of the things we use are all involved with electricity. And yet, I didn't know much about it. Maybe just a fact that Edison invented them. However at the end, I learned 8 criterias of them.
Our learning Goals:
1. How charges interact.
2. How charges are transferred.
3. How currents are produced.
4. Comparison of conductor and insulator
5. How resistance affect current.
6. How to calculate Ohm's law.
7. Types of circuits.
8. Relationship between power, volatage, and current.
Since these criterias were a lot for a single person to handle, our class was divided into 8 groups, and presented their criteria. Our group, Alli, Beatrice, and I did number 1. The relationship between charges. Luckily it was pretty easy, opposite charges attract each other, and equal charges repels each other. It was just like the Magnet rules.
Here is the poster that we made :
2. Charges can be transferred in three ways. Induction, Conduction, and Friction.
Induction: This is non-contacting transferring, that happens when charged object gets near the other object. Charged object's electric field attracts of repels electrons in the second object.
Conduction: This is direct contact transferring that occurs when charged object gets contacted with another object.
Friction: This is rubbing way of transferring charges. By rubbing, the object may lose electrons and may lose protons. Depending on the dominant charges, that object would be determined whether it is positively charges or negatively charged. One of the example would be balloon getting rubbed. When Balloon gets rubbed, it becomes negatively charged and attracts positively charged things.
3. Electric currents are continuous flow of electric charges through a material. Electrons always move. However, in order to produce currents, electricity should move in a one direction circuit that is being pushed by voltage. Meaning they must flow continuously from one place to another.
4. Conductor and Insulator are two opposite objects.
Conductor is a material that has loosely bounded electrons. In other words, it allows electricity to pass easily. Insulator however, is a material that has tightly bounded electrons. Therefore, electricity has hard time passing through them.
5. Resistance is the measure of how difficult it is for charges to flow through a material. So you can say that insulators have high resistance against electricity. The law of resistance is simple. The higher it is, the less current there is for a given voltage. When it is symbolized, it is called as Ohm.
6. Ohm's law. Ohm's law is basically a formula that explains the relationship between resistance, voltage and current. Resistance = Voltage/ current.
This can also be changed as
Voltage = Current x Resistance.
7. Electric circuits: Circuits are devices that allow electricity to flow. A circuit must include, devices that are run by electrical energy, source of electrical energy, and it should be connected by conducting wires. So, a circuit would have Wire, Switch, energy source, and Resistor. Wire works as passage of electricity. Switch works as controlling electricity. Meaning it controls whether it can flow or not. Energy source would be the source that produce electricity to run through wire. Resistor is a object that slows down the current flow. So far we've learned two types of circuits. Series circuit, and parallel circuit. Series circuit has only one path for a current to take. Therefore, when wire gets disrupted, all the current flow just stops. In contrast, Parallel circuits have multiple routines that a current can take. Meaning, even though the wire gets disrupted, the flow of current will not completely get affected.
8. Relationship between power, voltage, and current can be shown as a formula. Power = voltage x current. The definition of Power is the rate of energy transformed from one form to another. One of the examples would be hair-dryer. It's electrical energy is ultimately changed to heat energy to dry our hair.
To be honest, when other groups were presenting, I was bored, and didn't really pay attention. I regretted this a lot. The day before the quiz, I had to review everything. Voltage, Current, Ohm's law etc... The good part about this incident was that, I felt like I found more about myself. To be honest, I'm not a science fan or science nerd. I'm just a student that learns science like all the others. But different from other subjects, science attracts me. The process of learning Science just interests me, and makes me feel proud of myself after the progressment that I've made.
My goal was to learn all the criteria, and I think I somehow managed to achieve that. Now, my new goal is to listen to the teacher. Because, even when I study alone in home, teacher's word should always be remembered and followed. Also, my another goal is to fill my work habit grades to 'yes'. Work habit reflects how student puts effort in his/her work. After getting an 'F' I sincerely realized that 5% actually Matters.
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