Resistance in a Conductor: The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor. Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm (Ω).An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area. All materials show some resistance‚ except
Premium Electric current Superconductivity Electrical conductivity
Science February 6 2009 - February 19 2009 Conductor Investigation Calvin Chang 8.2 Stage 1: Planning the Experiment Introduction ! By “electric current”‚ I mean by the rate at which electric charges moves through a circuit‚ the electric charges can either be ions or electrons. They are measured in ammeters and the unit that is measured in is ampere which is the number of charges that passes through per second. There are many factors which would affect the electric current‚ like the voltage of
Premium Electric current Electric charge Measurement
Photosynthesis Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration‚ or converted into starch and stored. Oxygen is produced as a by-product. This process is called photosynthesis. Temperature‚ carbon dioxide concentration and light intensity are factors that can limit the rate of photosynthesis. Photosynthesis summary Photosynthesis [photosynthesis: The chemical change
Premium Photosynthesis Oxygen Plant
Topic 8: Cell respiration and Photosynthesis 8.1 Cell respiration 8.1.1 State that oxidation involves the loss of electrons from an element‚ whereas reduction involves a gain of electrons; and that oxidation frequently involves gaining oxygen or losing hydrogen‚ whereas reduction frequently involves losing oxygen or gaining hydrogen Oxidation involves the loss of electrons from an element‚ whereas reduction involves a gain of electrons; and that oxidation frequently involves gaining oxygen
Free Photosynthesis Cellular respiration Adenosine triphosphate
correct word or words. 1. energy is the ability to do work. 2. The main chemical compound cells use for energy is Adenosine triphosphate (ATP) 3. Ribose is a 5-carbon sugar molecule that is part of an ATP molecule. 4. The phosphate groups of ATP are the key to its ability to store and supply energy. 5. ATP releases energy when it breaks bonds between its phosphate groups. 6. Most cells only store enough ATP for short amounts of activity. 7. Label each part of the diagram of an ATP
Free Photosynthesis Adenosine triphosphate
Photosynthesis is a process through which plants and some certain types of bacteria get energy from the sun’s UV-rays and use it to create and store sugar that is transformed into ATP by cellular respiration later on in the process. In plants‚ this process takes place in chloroplasts‚ which concentrate in the mesophyll cells‚ with the help of chlorophyll‚ the green pigment‚ which is directly involved in photosynthesis. It is important to understand that we see leaves green simply because the green
Premium Photosynthesis Light
Photosynthesis By Sofie Inwood Aim: To determine whether chlorophyll and light is necessary for starch formation. Hypothesis: Chlorophyll and light are both necessary for starch formation. Materials: * 600mL beaker * Access to water * Safety glasses * Bunsen burner * Tripod * Gauze mat * A large white evaporating dish * Scissors and forceps | * Glass stirring rod * Test tube rack * Test-tube (30mm x 180mm) * Methylated spirits * Iodine solution * 100mL
Premium Photosynthesis Water Leaf
Harnessing of Solar Energy: Photosynthesis versus Semiconductor Based Solar Cell Photosynthesis and semiconductor-based solar cells are both used to harness solar energy from the sun – photosynthesis for plants and semiconductor based solar cells for human beings. Photosynthesis consists of light reactions and dark reactions. It is a process in which carbon dioxide (CO2)‚ water (H2O) and light energy are utilized to synthesize an energy-rich carbohydrate like glucose (C6H12O6) and to produce
Premium Energy Entropy Solar cell
effect of differing wavelengths of visible light on the photosynthetic activity of Beta vulgaris Introduction Photosynthesis is a crucial biological process that occurs within the chloroplasts of plant cells where CO2 + H2O + Sunlight C6H12O6 + O2. The chloroplasts use light‚ an electromagnetic energy source‚ to produce food for the plant in the form of sugar molecules. During photosynthesis‚ the excited electrons from the light pass through proteins in the electron transport chain (ETC)‚ where ATP
Premium Light Electromagnetic radiation Visible spectrum
Progress in solar PV technology: Research and achievement V.V. Tyagia‚ b‚ ‚ ‚ Nurul A.A. Rahimb‚ N.A. Rahimb‚ Jeyraj A./L. Selvarajb a Department of Physics‚ Manav Rachna College of Engineering‚ Faridabad 121001‚ Haryana‚ India b UM Power Energy Dedicated Advanced Centre (UMPEDAC)‚ Level-4‚ Wisma R&D‚ University of Malaya‚ Kuala Lumpur 59990‚ Malaysia Abstract The development in solar PV technology is growing very fast in recent years due to technological improvement‚ cost reductions
Premium Solar cell Photovoltaics