PHYSICS PERFORMANCE TASK 1
Cook It Well - Design a Fireless Cooker
Kathleen Poh Jia Min (13) 2SE
07.03.2016
SECONDARY 2 PHYSICS
SCALE DRAWING
CHOICE OF DESIGN
The design of my cooker is a box cooker. I decided to use a box cooker design as it is the simplest to construct, handy and it cooks easily, without the need to keep turning it with the direction of the sun. As the cooker will be used in a forest, it will be more convenient to just leave the cooker in the open while I can go and search for the Orang Utans. I cannot do that when I need to turn the cooker regularly. I also decided to only use one reflective pane as it is more efficient and easier to manage. I will only need to adjust the angle of that reflective pane instead
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It uses reflection to heat up the food. Sun, the main source of light and heat energy hits the reflective pane of the cooker and reflects the light through the plastic cover and into the box cooker. The four reflective inner sides of the box reflects and concentrates the light on the pot (Aluminium can) containing the food. The black around the pot absorbs the heat and changes the light into heat to heat up the food it is containing. The heat is trapped inside due to the plastic cover which is a poor conductor of heat. The heat is also reduced by the cardboard and rolled-up newspapers. The rolled-up newspapers have air spaces between them that have air which is a poor conductor of heat. This causes the heat loss to be greatly reduced, keeping the pot and food …show more content…
It was very hard the make sure the aluminium foil is pasted with any wrinkles as it may affect the reflection. I tried my very best to straighten it out as much as possible but there were still wrinkles and creases that I could not do anything about it. I also took a really long time to paint the surfaces and aluminium can black as it was not a small area to cover but finally finished it after a long time.
AFTER THE EXPERIMENT
My cooker was able to heat up the water by a few degrees but it was not the best one. After seeing all my friends’ cooker, I came to a conclusion that cookers that involve the use of magnifying glasses or any special lenses were the most effective ones. This is probably because it concentrates light onto the water making it heat up faster than just using reflection. However, based on practicality wise, I felt that my cooker was better. If one was really in the jungle, it is quite unrealistic to stand there and use the magnifying glass to cook for such a long time. The magnifying glass may also cause a fire as it has the ability to burn something and it may
This was both a success and failure. It was a failure because after heating the
Wikipedia contributors. "Sam Cooke." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 16 Jun. 2010. Web. 17 Jun. 2010.
on how long it takes to heat up. If we heat a large volume of water it
water has risen to 60°c I will then put the lid on the spirit burner
Wait until the water boils and record the temperature to make sure that it is 100 degrees
Three types of heat transfers help solar cookers use the sun’s energy to cook food. Heat is always transferred from the warmer object to the cooler object. Heat is also transferred to and through some materials better than others. The three types of heat transfers are radiation, conduction, and convection. Convection is the heat transfer by movement through materials such as air or a liquid. Materials like these are called mediums. Convection is the primary way heat can be transferred through liquids and gases. To classify a heat transfer as convection, hot air has to rise up to equally heat the air around it. Box solar cookers have to retain this hot air to cook food, so the cookers have to have lids with a transparent covering. The transparent covering shuts in all of the hot air and keeps out the cool air. The second heat transfer is the transfer of heat between two objects, or substances, that are directly in contact with each other. This heat transfer, called conduction is the primary way heat can be transferred through solids. In gases and liquids, conduction works poorly because the atoms have a great deal of space between them. Since they have a lot of space between each other, they can’t communicate heat to one another. The solid, aluminum foil, is commonly used in homemade solar ovens because it is a metal. It is well known metal is a great conductor of heat. Since metal (aluminum) is a great conductor of heat, whatever comes in contact with it will gradually absorb the heat from the metal. The third type of heat transfer is radiation. Radiation is the transfer of energy (heat) through space by electromagnetic waves. Solar energy reaches Earth by radiation (Pearson 485). When an energy wave comes directly in contact with...
Using a Bunsen burner and a thermometer controlled bath instead of an electronic water bath.
This reflective essay will lay emphasis on one of the learning needs I have developed during my two week taster placement in hospital. Reflection helps an individual build upon their skills and makes room for self-criticism as he or she can contemplate upon actions and make relevant changes (Taylor, 2000). I will be applying the “What”, “So what” and “Now what” model of reflection by Driscoll (2000) in this piece of work because it is a more coherent and comprehensible approach to follow when writing a reflective account and is also an easier guide to writing reflections. The learning need I chose to reflect on from my learning plan is having a better understanding of diabetes and the 6 basic medications used in treating the condition since it is a common illness on the ward I am have been allocated on for my first placement. The timescale set for achieving this objective was by the end of my two week placement that is from 27th January to 9th February and I achieved it with the help of a host of factors. In this assignment, all the names of the patients and wards have been omitted and indicated with letters and numbers for confidentiality reasons as stated in the Nursing and Midwifery Council (NMC) code of conduct (2008). The paper will primarily touch on the type 2 diabetes and furthermore on the achievement on my learning need.
Glassman, Bernard, and Rick Fields. Instructions To The Cook. 1st ed. New York: Bell Tower, 1996. Print.
Aim: To find out what type of insulation holds the most heat for a can
Do you do a lot of cooking? An inexpensive thermometer is most cost-effective for someone who doesn’t cook a lot of meat and poultry.
day. For many people, one of the first things they do when they wake up, is to cook.
This lesson is designed to review and reinforce a few important concepts about plants (e.g. Needs, parts, sequence of planting) and to also guide the students through applying a few scientific inquiry (e.g. Making observations, experimentation, discussion, reflection, reporting results etc.). The students have previously planted corn and bean seeds and today’s lesson has provided the students a chance to see the results of the planted corn and bean seeds. Additionally, seeds have been planted under and growing under the following conditions: without water, and without soil. The students see the results of these seeds planted under these conditions for the past week. Two plants in particular have already been grown their growth has been
This significantly shortened the time for cooking and as an added advantage, the nutrients (hence the taste) are retained making the food more delicious. Since the boiling point is much higher, this would also kill more germs and make the food last longer.
I will fund my exhibit through donations and sales. I would reach out to the community, explain my exhibit and ask for donations, but I would primarily generate revenue through selling items related to the exhibit like prints of the works being shown, creative posters, key chains, t-shirts and other mementos. Additionally, I would have bake sales and fairs and other activities of a similar nature.