Physics Isa - 5718 Words

Introduction I have chosen to investigate a factor that affects the output of a potential divider circuit. A potential divider is resistors connected in series across a voltage source; used to obtain a desired fraction of the voltage. A resistor is a device having resistance to the passage of an electric current which affects the output voltage (Vout). The factors that I could investigate are changing the resistance of r2 and record the output (Vout), or use a light-dependent resistor (LDR) and change the resistance of r2 and record the output (Vout). Theories Resistors restrict or limit the flow of current in a circuit. The ability of a material or component to resist current flow is measured in ohms. There are three main types of†¦show more content†¦Its value decreases with increasing incident light intensity. An LDR is made of a high-resistance semi-conductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electron (and its hole partner) conduct electricity, thereby lowering resistance. A photoelectric device can be either intrinsic or extrinsic. In intrinsic devices, the only available electrons are in the valence band, and hence the photon must have enough energy to excite the electron across the entire bandgap. Extrinsic devices have impurities added, which have a ground state energy closer to the conduction band – since the electrons don’t have as far to jump, lower energy photons (i.e. longer wavelengths and lower frequencies) are sufficient to trigger the device. Two of its earliest applications were as part of smoke and fire detection systems and camera light meters. Because cadmium sulphide cells are relatively inexpensive and widely available, LDRs are used in electronic devices that need light detection capability, such as security alarms, street lamps, and clock radios. References: * http://www.bbc.co.uk/schools/gcsebitesize/design/electronics/componentsrev4.shtml * School science text book Prelims: I aim to carry out two preliminary investigations toShow MoreRelatedProgram Of Interest : Mba / Technology Management1057 Words   |  5 Pageswas able to secure 82.26% and 76.83% respectively. Initially I was puzzled by the formulas and logical orientation in the physical sciences. The timely guidance and support I received from my teachers and parents helped me grasp the principles of Physics and Mathematics which led me to pursue my career in Electronics Telecommunication Engineering. As a culmination of my efforts, I qualified for admission into the prestigious Bharati Vidyapeeth College of Engineering, Belpada Mumbai (Affiliated toRead MoreProgram Of Interest : Mba / Technology Management1057 Words   |  5 Pageswas able to secure 82.26% and 76.83% respectively. Initially I was puzzled by the formulas and logical orientation in the physical sciences. The timely guidance and support I received from my teachers and parents helped me grasp the principles of Physics and Mathemat ics which led me to pursue my career in Electronics Telecommunication Engineering. As a culmination of my efforts, I qualified for admission into the prestigious Bharati Vidyapeeth College of Engineering, Belpada Mumbai (Affiliated toRead MoreParkinsons Disease2662 Words   |  11 PagesAyon sa pag-aaral, sa 40 pares ng mga kambal, isa lamang ang nagkakaroon ng Parkinson’s disease. Ikalawa, malaki ang posibilidad na ito ay galing sa isang virus na naging sanhi ng impeksyon sa utak. Ngunit, kahit malawak na ang kaalaman natin ukol sa paghahanap kung ano ang virus na sanhi ng sakit, hindi pa rin matiyak at maituro ang virus na maaaring sanhi ng Parkinson’s disease. Ikatlo, malakas ang paniniwala ng mga manggagamot na ang depresyon ay isa sa mga unang ipinapakita ng mga may sakit naRead MoreWeather Associated On Weather Conditions1219 Words   |  5 Pagesneural network a statitical model is developed. Artificial neural network was combined with the genetic algorithm t o get the more optimized prediction . An improved technique that uses artificial neural network with photovoltaic system was proposed by Isa et al.that utilizes perceptron model with Levenberg Marquardt algorithm. Apart from neural network Fuzzy logic has also been being used in weather prediction models. The rainfall was classified into three fuzzy sets which can be predicted by makingRead MoreTransformed World View Essay1581 Words   |  7 PagesChapter 8, Page 152 1. Consider the farmer in Isa. 28:23-29, whose God-given knowledge of farming techniques comes through general revelation. Have you ever experienced anything similar? Have you ever learned how to do something through tradition, observation, experimentation, but believe the lessons come ultimately from God? (INSERT ANSWER HERE) 6. A friend tells you that she is struggling because her sociology (or psychology, or physics) professor is regularly saying things that conflictRead MoreNew Horizons And Its Mission1511 Words   |  7 Pagesinert mass (Spaceflight). An Interstage Adapter is used to connect the parts of the rocket with different diameters. There are two types; the Cylindrical Interstage Adapter (0.32 meters in height, 3.83 meters in diameter, and 285 kilograms) and the C-ISA Adapter (3.81 meters in height, 3.83 meters in diameter, and 2,212 kilograms) (Spaceflight). The Centaur Upper Stage is 12.68 meters in length, 3.05 meters in diameter and has an inert mass of 2,243 kilograms. This part has a single engine and alsoRead MoreDetailed Timeline Of The Periodic Table And The Major Contributions Made By Notable Scientists2349 Words   |  10 Pagesand includes Mount Tom Price mine and the Mount Whaleback mine. There are also uranium ore deposits, including the Ranger mine located in 230km east of Darwin. The Mount Isa mines in Mt. Isa produce copper, zinc, lead and silver. In North Western Queensland and includes the Mount Gordon mine and is approximately 120km north of Mt. Isa. (c) For the mining of an ore to take place, it has to be economically viable. Outline two situations which would make an ore economically non-viable. There are severalRead MorePhysics Form 4 Chapter 34802 Words   |  20 PagesDiscuss your physics questions online at www.physics4spm.com 3 FORCES AND PRESSURE 3.1 UNDERSTANDING PRESSURE Pressure is force per unit area Pressure = Force Area P= F A 1. Define Pressure 2. State pressure’s formula 3. State relationship between pressure and area. 4. Describe applications involving High Pressure Increasing the pressure by reducing the area A sharp knife has a very The studs on a football small surface area on its boot have only a small cutting edge so that high area of contactRead MoreThe Benefits of Space Exploration Essay1809 Words   |  8 Pagesbetterment of scientific cooperation among their respective agencies which were the European Space Agency, Space Research Institute, the Institute of Space and Astronautical Science, and the National Aeronautics and Space Administration. (UMD Space Physics Group, 1995, para. 2) From February 1994 to June 1998, space shuttles made 11 flights to the Russian space station Mir, and American astronauts spent seven residencies onboard Mir. Space shuttles. (Wilson, 2007, para. 7) The teamwork between theseRead MoreTima Management9075 Words   |  37 Pagesmag-aaral kung kaya’t hindi ito nakakasunod sa sistematikong paghahati ng ora s. Nilista ni Rodger Constandse (Constandse, 2004) ang mga problemang maaring matamo o makita sa paggawa ng mga proyekto. 1. Stress, Palagiang pag-aalala at Overwhelm Ang isa sa pinakasikat na nagiging problema ng mga mag-aaral ay ang pagramdam ng matinding stress at natataranta dahil sa pag-iisip na maraming dapat tapusin. Nahinuha ni Constandse na may tatlong pangunahing sanhi kung bakit nila ito nararanasan. Una, nakakaramdam