Light Intensity
Hypothesis
§ A light bulb gives out light when electricity passes through it
§ The more volts you add, the more intense the light is. As you double
the voltage, the light intensity doubles.
§ This is because the rays are more concentrated. The rays are twice
as concentrated as the intensity doubles, as more power is running
through the circuit
§ The LDR (Light dependent resistor) measures how intense the light is
§ The LDR frees up electrons, decreasing resistance
§ The more intense the light is, the lower the resistance in the LDR
§ Ohms law says that current increase is proportional to potential
difference
§ This only occurs if all conditions are the same
§ As Potential difference doubles, Current doubles.
§ Resistance is voltage over current.
§ If voltage rises proportionally with current, then resistance will
halve as voltage doubles.
§ So as I halve the voltage, the current halves, light intensity
halves, and resistance doubles.
Method
This is how I will set up the apparatus. Below is a circuit diagram.
The set up of the circuit is simple as shown above. The 12-volt lamp
is set up in a simple circuit. Then in a SEPARATE circuit, the light
dependent resistor is connected to the Multimeter, which shows the
resistance readings. If I did connect the LDR in the same circuit, I
would almost certainly fry the LDR, and ruin the experiment! I want to
keep the distance from the lamp to the LDR the same. I have decided
after testing the system, to put the LDR directly under the lamp. This
makes me get the best readings for the earlier voltages when the bulb
is dim. It als...
... middle of paper ...
...DR is slightly
faulty. This would not make a large difference, but would make me feel
that the test is that bit fairer.
These could all be incorporated into the method, and if I did this
experiment again, I could add these extra points to the method
§ Keep a cover on the bulb to make sure all the light hits the LDR
§ Use the same practical equipment
§ Try to work as far away from other people as possible.
Other than that I think the method works well. I left out the points
regarding letting the system cool down, as there is not enough time to
do the experiment in, and I could certainly not use a whole day to
take results. If I had the time, I would also try to take more sets of
readings, up to 10 sets, to get the best graphs. However, the above
points are a realistic way of improving my results next time.
In the movie Edward Scissorhands, a lot of different cinematic techniques are used. This movie mostly focuses on lighting, usually using darker low-key lighting throughout most of the film to create a darker, creepy tone. Low-key lighting is used mostly in scenes with Edward scissorhands in them, not as much with the girl. A good example of these low-key lighting scenes are the beginning ones, when the girl first enters Edward’s castle. The atmosphere inside is dark and creepy, adding to the already mysterious and dark tone of the movie. Another example of a scene with low-key lighting is the very beginning of the credits screen. The words are displayed in white with the rest of the background as a dark and evil setting. This already gives
The book All The Light We Cannot See by Anthony Doer, was not your traditional love and war story. It’s about a young blind girl named Marie growing up in the war, who had a connection with a young boy named Werner who is a part of the Hitler youth. There are a few other characters who are all in different parts of the world, and yet they eventually all meet up together and find out they all have some type of connection between each other. All of the characters in the book were affected by the war, and caused them to change into the characters that they ended up to be.
War was one of the most difficult and brutal things a society could ever go through. World War II was especially terrible because it affected so many people.World War II was centered in Europe and the people of the European countries felt the effects much more than many of the other countries that were also participating in the world war. In the book All the Light We Cannot See written by Anthony Doerr, the story took place during World War II in Europe, the center stage for the war. This war was one of the most difficult wars because it destroyed homes, displaced thousands, tore families apart, killed off loved ones, and forced people to make tough decisions they had to live with for the rest of their lives. In All The Light We Cannot See,
In Nathaniel Hawthorne’s, The Scarlett Letter, the nature of evil is a prevalent theme that is depicted throughout the novel. Hawthorne is considered by many to be one of the most significant writers during the romantic period of American literature. Many of his writings countered the ideas of Transcendentalism, which was a popular belief during his time. Trancendentalism is described as “an idealistic philosophical and social movement that developed in New England around 1836 in reaction to rationalism . . . it taught that divinity pervades all nature and humanity, and its members held progressive views on feminism and communal living”().
“Hope in the face of difficulty. Hope in the face of uncertainty. The audacity of hope! A belief in things not seen. A belief that there are better days ahead.” President Obama’s 2004 keynote speech gives a timeless message of hope that especially resonates with minorities who face an uncertain future. Similarly, in her novel Beloved, Toni Morrison develops the theme that hope in the face of forced dehumanization, through the relationship between darkness and light, gives the oppressed a purpose and the ability to overcome and thrive despite persecution.
In the French coastal town of Saint- Malo in August 1944, War World II is coming to its high point. The allies are landing and fighting against Germany. Anthony Doerr’s “All the Light We Cannot See” is a historical fiction book, with a wide-ranging language and characters who are both courageous and heartbreaking. Doerr brings together the stories of a French girl named Marie-Laure, who has lost her eyesight and a German orphan named Werner. As Hitler upsurges, Marie-Laure and Werner lives and families are torn apart by the war. Anthony Doerr 's’ use of imagery, and metaphor, he stresses the damage of life that war creates. Since the characters were affected by the war and also affected by their experiences, all characters went through a change
The incandescent lamp has been around since its beginning stages in the 19th century. The chapter titled “Incandescent lamps” in the book Revolution in Lamps:...
Altering an audience's opinion is a struggle that many writers face; it is always possible, however, to unite the reader with the speaker's position. In Paradise Lost by John Milton, the author attempted to persuade his readers into thinking that the theme of obedience to God will keep you in a blissful state and disobedience will keep you in a wretched state by the use of light in his books. God is associated with a radiant white light; while on the other hand, Satan is affiliated with a dark shady black. With this use of this contrast of symbolism of light and dark, there is a clear distinction that light is righteousness and more desired than the darkness, which is evilness and bad.
Rene Descartes’ natural light is his saving grace, and not Achilles’ heel. Descartes incorporates the concept of natural light within his epistemology in order to establish the possibility of knowing things completely without doubt. In fact whatever is revealed to the meditator via the natural light is considered to be indefeasible. The warrant for the truth of these ideas does not rely on experience or the senses. Rather the truth of the idea depends on viewing the concept through clear and distinct perception. Descartes’ “I am, I exist”, (Med. 2, AT 7:25) or the ‘cogito’ is meant to serve as the basis for knowing things through clear and distinct perception. Descartes’ cogito is the first item of knowledge, although one may doubt such things as the existence of the body, one cannot doubt their ability to think. This is demonstrated in that by attempting to doubt one’s ability to think, one is engaging in the action of thought, thus proving that thinking is immune to doubt. With this first item of knowledge Descartes can proceed with his discussion of the possibility of unshakeable knowledge. However, Descartes runs into some difficulty when natural light collides with the possibility of an evil genie bent on deceiving the meditator thus putting once thought concrete truths into doubt. Through an analysis of the concept of natural light I
In 1998 a Maryland neurologist, Dr. Christopher Newman, was diagnosed with brain cancer and he could no longer work as a result of his disease. He claimed that the Motorola cell phone he had in 1992 to keep in touch with his patients gave him cancer. Then in 2000, he filed an $800 million lawsuit against several wireless providers including Motorola Inc., Verizon Communications Corp., Bell Atlantic Mobile Systems, and others. Within a month, the U.S. District Judge Catherine Blake dismissed the case due to lack of evidence. This case happened during a time where people were confused about how electromagnetic radiation affects the human body. Fast-forward to today and there is still confusion. A lot of people today feel like they are at risk from developing cancer from electronic devices like cell phones, microwaves, and laptops. That is simply not true.
The Effect of Intensity on the Power of Solar Cells This experiment involves changing the intensity of light falling on different cells and measuring their power outputs. Higher intensity of light means that there are more photons hitting the surface of the cell per unit area per second. The more hit the cell, the more rapidly the electrons move across the p-n junction, so the larger the emf produced. If the rate of movement of electrons is inhibited, then the greater the rate of supply of photons (intensity), the more will not successfully excite an electron, so the lower the efficiency of the cell.
“Sometimes, I still tell my friends I do not hate my body anymore so they would stop asking about my recovery.” (Zhang 4)
The world today would be lost without lighting fixtures, especially light bulbs. They have provided us with the ability to work at night. Additionally, they keep our streets safer, from the point of view of a innocent human being walking down a street or a car passing through an intersection. We know that light technology will continue to grow and improve. As many environmental problems are discovered, it will become necessary to create greener lighting fixtures. These improvements will not be achieved by one person alone, but by the entire human race working together and educating themselves.
Since its adoption in the late 19th century, Edison’s incandescent light bulb has seen remarkably little change and development. In comparison to other technologies, its growth has been almost non-existent. In fact, today’s bulbs operate under the very same principle that Edison’s did: incandescence. Incandescence is the basic principle that heated objects, like the tungsten filament of a light bulb, radiate light. While it is often the simplest solution that is the most successful, it is not always likely to be the most efficient. Traditional incandescent bulbs waste nearly all the energy they consume as heat, leaving very little to be used in the production of light making them one of the least efficient technologies we use every day. Despite this, incandescent bulbs dominate residential lighting with a large role in commercial lighting as well. Americans have always prided themselves on being leaders of technologic advancements and are responsible for some very impressive technology. The semiconductor industry for example, has grown over a million times more efficient in just the past fifty years [CITE]. This reputation makes it surprising that an American technology so radical at the time of its development and so widely adopted in our society has remained so static in time. This paper’s focus is the attributes of this technology that have resulted in such stagnant growth and to investigate other technologies, specifically compact fluorescent lights (CFLs) and light emitting diodes (LEDs), which could finally bring this market into the 21st century. Additionally, it looks at policies implemented by the government whose intention is to speed up the adoption of this technology and what the growth of this industry might look lik...