DC Circuits

DC Circuits stands for direct current circuits. These circuits are closed circuits that are connected back to the source of their power to complete the current. The way to solve different aspects of DC Circuits is Ohm's Law. Ohm’s Law states that the current of a circuit is proportional to the applied potential difference. These circuits are made up of an energy source with different resistors on a closed circuits.

The first circuit has two light bulbs in series. If one of the light bulbs is removed, the other light bulb goes out because the circuit is no longer complete. As more light bulbs are inserted, the resistance increases, and the current decreases. If the light bulbs have different resistances, then the voltage is different at each point. The lights are not as bright as one light because the voltage is half as what one light bulb could be, because the voltage is divided between the two.

The second circuit is in parallel. Both of the lights are equally bright, because the same amount of volts is sent across both light bulbs. For example, if there was a 12 V energy source, then 12 V would be sent through each light bulb. The resistance through the current is the same throughout the whole parallel of the circuit. If one of the light bulbs was to be taken out, the other would still be lit because it still had a complete circuit, and it would still be as bright.  The value of the current is the reciprocal of the resistance.

The light bulbs that are in parallel are in series with the other light bulb. The single light bulb is much brighter that the ones in series, which are the same brightness. The voltage of the series is equal to the voltage of the bulbs in parallel.  The current of the complex circuit is the total voltage divided by the combination of both currents through the series and parallel circuits.  The equivalent resistance is found by combining the resistance of the parallel light bulbs with the light bulb in series.  As more light bulbs are added, the resistance could increase or decrease, depending on weather the light bulbs are in series or parallel.

Stupid Zombies Hall of Mirrors

Step right up ladies and gentlemen. Come and compete for your chance to win. Simple hit the zombie first and you are the victor. Just bounce your laser off the mirrors to hit your target. Based off of the acclaimed app, Stupid Zombies. Compete to put your name the leader board. Check it out!

Stupid Zombies Hall of Mirrors on Prezi

https://sites.google.com/a/parishepiscopal.org/physics-honors/amusement-park/team-2

Team 2 wiki page

In the Rays of the Sun

Natural photograph of the waves of visible light from the sun

The sun is the only provide of natural, visible light. This light travels at 3 X 108 m/s, the speed of light. The visible light from the sun is the smallest section of the Electromagnetic Spectrum. These visible light waves are the middle in size and frequency of the Electromagnetic Spectrum. This light is what allows us to see all of our favorite colors. Isaac Newton invented the prism to visualize the colors. The different colors of the light are seen in different frequencies. The “cooler” colors have shorter wavelengths, while the warmer colors have longer wavelengths. The prism changes the “white light” into all these different frequencies. Water has the same ability as a prism, hence rainbows. The lens of my camera became a mini prism and mad little red circles, changing the frequency of the light. Parts of the sun’s rays are absorbed by the earth, and parts are reflected back into the sky. This photo is titled, In the Rays of the Sun, because the rays of the sun move our world. Quite simply, the main use of the sun’s rays is to be able to see things.

Through the Spectrum of Electromagnetics

Another story from my Physics life. Since we are now studying waves I must understand the different types of waves in the, ELECTROMAGNETIC SPECTRUM? What is that, well I didn't know until I did a little research.

The EM spectrum is the space in which all of the waves that people use travel through. Like gamma rays, X-Rays, Ultraviolet rays, Infrared rays, Microwaves, and Radio waves, ordered from smallest to largest. We use all of these waves every day, from doctors using X-Rays, to regular people popping popcorn.  All of these waves could take hours to explain, so I will focus on two; X-Rays and Radio Waves.

X-Rays are mainly know in the use of them by doctors to discover broken bones and problems inside of a patient.  X-Rays have a frequency of 5E15 Hz and a wavelength of 8E-8 m.  X-Rays are above the frequency of visible light, which makes them impossible to see.  X-Rays occur naturally mainly in outer space.  The X-Ray machines that doctors use send X-Rays into ones body and create a shadow over something that it cannot pass through, such as a bone.  Overexposure to X-Rays can cause serious damage to the cells of the body, because of this doctors use lead to protect the body from overexposure.  Supernovas and black holes also emit X-Rays, and are discovered by NASA in using X-Ray visualizing satellites.  The difference is that medical X-Rays do not occur naturally and are man made.

Radio waves are used by being sent from a transmitter to a reciever. Radio waves are the most used out of any of the waves in the EM spectrum.  They have a low frequency of about 6E2 Hz and a large wavelength of anywhere from 3 to 300 meters.  Radio waves have too low of a frequency to be seen.  Every time someone uses a phone, turns on the radio, or watches TV, they are using radio waves by sending a signal to and from a transmitter and reciever.  Radio waves are also used in the ocean and the air to communicate between crafts to prevent crashes.  Radio waves are mainly used for communication, listening to your favorite music, and watching your favorite show.  They are also used in militaristic ways, for detecting enemy ships and planes, to simple leisurely ways, like popping popcorn.

There you have it.  That is my in depth look into the WWES (Wide World of the Electromagnetic Spectrum). 

Attributions:

http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html

https://www.whitbypandemonium.co.uk/images/XRay-Cat-Patch.jpg
http://school.discoveryeducation.com/lessonplans/interact/electromagneticspectrum.html
http://collegehilloh.net/enewsletterarchive/images/graphics/radio%20interference.jpg

My Journey Through Energy Transfers

       This is a presentation of how energy is transferred in nature.  Birds use the transfer of Gravitational Potential Energy to move and survive.  Birds transfer all of their Potential energy into Kinetic Energy so that they can fly at blazing speeds and catch prey.

        The system in this particular example is the bird and the earth.  The only transfer of energy is from full Potential to Kinetic and some potential.  The bird dives down, reducing air friction in an aerodynamic shape.  This transfers all of the Energy to Kinetic energy.  The formula for the bird's energy would be PEG=KE.  Velocity, in meters per second, and mass, in kilograms, are necessary for solving the Kinetic energy as 1/2xv^2, in Joules.  The height, in meters, the mass, in kilograms, and the gravitational pull of the earth, 9.8 meters per second squared, are necessary for solving the Potential Gravitational Energy as mgh.  That's my story of Energy Transfers and how it relates to the beauty of nature.

Attributions

http://www.hickerphoto.com/data/media/161/flying-birds_T5301.jpg
http://english.pravda.ru/images/photo/3/0/0/35300.jpeg
http://www.hickerphoto.com/data/media/161/birds-of-prey_T5808.jpg
Create your own video slideshow at animoto.com.

Mythbusters Lab 2

Myth #2: An object always changes its motion if there is a force exerted on it.

Statement: If an object always changes its motion if there is a force exerted on it by other objects, and we roll a ball at a bottle, then the ball will stop.

The sum of the forces is -Fn1 but the ball rolls through the bottle without changing direction, disproving the myth.

Conclusion:

       My prediction was wrong since the ball rolled straight through the bottle and didn't change direction at all.  I believed that the ball would somewhat change direction, but nothing of that nature happened.  If the ball had hit a wall, then the ball would have bounced back and changed in the complete opposite direction.  This is a commonly believed myth.  When there is a large force at play, but when there is a small force it doesn't affect it at all.  The myth is one of those "no duh" type things, but it turned out to be false.

Mythbuster Lab 1

During this episode, I will be testing a myth sent to me by my physics teacher.

Myth: An object always moves in the direction of the net force exerted on it.

Prediction: If an object always moves in the direction of the net force exerted on it, and we drop a ball on the ground, then the ball will bounce, and continue in the opposite direction of the force of gravity, disproving the myth.

The sum of the forces is -Fg while the ball is in the air after it hit the ground, but it is still rising and it comes back to Tori.

Conclusion:

The myth is busted because the ball rose and came back to Tori.  Originally, I thought that this would be very difficult to bust, but I believe that this test thoroughly busted the myth.  Most people would believe this myth because an object mostly moves in the direction of the applied force, which is probably the origin of this myth.  Our testing busted the myth, and I hope that this will make people rethink their thought process.