Electricity, Importance of electricity, Electric Current, Resistance

Electricity is a energy form that is resulting from the existence of charged particles, such as positive and negative charges orbiting around the nucleus. Electricity is used for cooking, communication, laptops among many other things in our everyday lives. Electricity is important because it helps us to see at night when its dark, power our televisions, it is made by burning oil and natural resources. Electric Current is the rate of charge flow past a given point in an electric circuit, measured in coulombs/second also known as Amperes. Resistance is the ratio of voltage applied to the electric current that flows through it using the equation R=V/I. If the resistance is constant over a range of voltage then Ohm's law can be used which is, I=V/R.

Capacitance

There are many uses of capacitors in our everyday lives, but the first one that i found was what i am using to type this right now and control my computer which is my mouse pad. Our mouse pads have two metal plates with terminals and a dialect in between them. The duty of a capacitor is just to store a charge. More examples of a capacitor besides the mouse of our keyboard are, the keys on our keyboard, our touchscreen phones, our TV remotes. All the buttons that we press have little capacitors inside of them. Without capacitors most of our electronics wouldn't be able to function.

Electric Potential Energy

Electric Potential Energy is the amount of energy a charge has based on the position of the charge in an electric field. The unit of Electric Potential Energy are Joules. In a diagram like the one above, the positive charges always have the higher potential energy and the negative charges always have the lower potential energy. Also, the flow of the energy in the diagram above goes from positive to negative. So if the positive test charge is near the positive charges it will have high potential energy, but if the positive test charge is near the negative charges then it will have a lower potential energy.

Electrostatics

Electrostatics is studying stationary electric charges or fields. This is talking about positive and negative charges along with neutral charges. In this picture a student is rubbing there socks on the ground which is charging by static friction. If it was in a cold dry environment and the student was to rub their socks and then touch someone, they would get a static shock. This is caused because of electrons building up and when they get near a neutral or positive charge they would want to jump off causing a shock. It doesn’t work very well in wet environments, the charge depletes quicker in that kind of environment.

DO WORK!

When you think of doing work you think of school or having a job. But in physics “work” is a measurement. Work is equal to force times distance (W=FD). Work is measured in Joules (J), force is measured in newtons, and distance is measured in meters. A newton is equal to the mass of something times gravity (N=mg). It is a fairly easy topic to learn. If you have force and work you can find distance, if you have distance and work then you can find force and ect. The person in this picture is doing work because the mass of their finger is going the distance down to the keyboard. So if the mass of his finger was .4kg and it had to go .1 meters down to the keyboard then the work that he would have is 0.04 J. W=FD.

What I am thankful for

Thanksgiving isn’t just about what you are thankful for in life, but it is also about what you are thankful for in school subjects like physics. There are many things to be thankful for in physics but the one thing that I am the most thankful for is gravity (-9.8 m/s^2). It is the best thing that has ever happened to the world and to physics. Without gravity everything would be floating around and it would be hard to do anything with out it. That is why everything in my room is not floating; it is staying down, because of gravity.

Momentum

Momentum is a very confusing topic for me, especially when you talk about change in momentum (impulse) versus change in speed. It is hard for me to tell the difference. In this picture a football player is getting tackled into the ground. The whole way down after he is hit there is no impulse but once he begins to hit the ground the impulse has a big small force and a large contact time, that is the same as if he his a hard surface because there would be a great force over a small contact time, they balance out. Overall he has a large momentum because has has a large mass and a large velocity moving forward.