Essays Tagged: "Electric current"
Voltage - Current relationship in a DC circuit
wn in this relation, V represent voltage which is the potential difference across the two ends of a electrical conductor and between which an electric current, I, will flow. The constant, R, is called ... it directly provided that the remaining variable V and I is known. A resistor is a piece of electric conductor which obeys Ohm's Law and has been designed to have a specific value for its resi ...
Subjects: Science Essays > Physics
Superconductivity
blems and some examples of its uses.CONDUCTIVITYConductivity is the ability of a substance to carry electricity. Somesubstances like copper, aluminium, silver and gold do it very well. They arecalled ... like copper, aluminium, silver and gold do it very well. They arecalled conductors. Others conduct electricity partially and they are calledsemi-conductors. The concept of electric transmission is ve ...
Subjects: Science Essays > Physics
DNA electropherises
el. The DNA samples are loaded using a measuring instrument called a micropipeter. There is then an electric current passed through the gel to separate the DNA fragments. The current separates the DNA ... ergy in nuclear plants so strict safety precautions are taken. Some research shows that exposure to electric magnetic fields, such as power lines and electric appliances, is a possible risk factor. Mo ...
Subjects: Science Essays > Genetics & Genome Projects
Talking about investigating the resistance of a wire
th of a wire affects the resistance of it.TheoryResistance is a force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around th ... t the flow of particles if the wires are either very thin or very long. E.g. the filament across an electric bulb is quite thin as needs to resist the flow of particles for the bulb to glow.Resistance ...
Subjects: Science Essays > Physics
Solar cell technology.
erel observed that shining light on an electrode submerged in a conductive solution would create an electric current. Later in 1877, Charles Fritts constructed the first true solar cell by using junct ... hotovoltaic modules, increase module efficiencies, decrease direct manufacturing costs, and improve electric power production costs. Pv for Utility Scale Applications (PVUSA), a national public-privat ...
Subjects: Science Essays
How an electric generator works and what parts it consists of.
An electric generator is basically an electric motor working backwards. An electric motor converts elec ... otor working backwards. An electric motor converts electrical energy into mechanical energy, and an electric generator converts mechanical energy into electrical energy. An electric generator looks al ... nverts mechanical energy into electrical energy. An electric generator looks almost identical to an electric motor. Each consists of a loop that is able to rotate in a magnetic field. The electric mot ...
Subjects: Science Essays
Chemistry electrolysis coursework
It is known that by passing a constant electric current through an aqueous copper sulphate solution that the passage of ions through this s ... of any element deposited during electrolysis is directly proportional to the number of coulombs of electricity passed"Faraday's Second Law of electrolysis states that:"The mass of an element deposite ... araday's Second Law of electrolysis states that:"The mass of an element deposited by one Faraday of electricity is equal to the atomic mass in grams of the element divided by the number of electrons r ...
Subjects: Science Essays > Chemistry
Cloning-definitions, pros, cons.
a skin cell) from a donor. This combination of the two cells is then activated , mostcommonly by an electric current. If all of this goes well an embryo begins to develop.There are three types of scie ...
Subjects: Science Essays > Genetics & Genome Projects
Electro-Static Revision Notes
*Electric Current is a flow of electric charges, consisting of electrons. Two types of charges - posi ... (t)*Coulomb (C) is amount of charge passing a point when a current of an ampere flows for a second.*Electricity is conducted only through material soluble in water when in water, aqueous solutions and ... q is charge and r is distance - if more than two charges use vector addition - find the resultant.*Electric field is produced by a charge or a combination of charges. Forces are felt depending direct ...
Subjects: Science Essays > Physics
Acid
in your stomach to help digest food. Sulfuric acid is found in car batteries. Acids can conduct an electric current. Acids are also corrosive. When acids react with metals they form hydrogen gas. Whe ... olytes. When they are dissolved in water they produce a solution that contains ions and can conduct electricity. In 1884 Svante Arrhenius proposed that an acid be defined as a hydrogen-containing comp ...
Subjects: Science Essays > Chemistry
Investigating the rate of electrolysis. An investigation to find out what factors affect the rate of electrolysis of a solution containing copper (II) ions.
f electrolysis of a solution containing copper (II) ions.PlanIt is known that by passing a constant electric current through a copper sulphate solution the passage of ions through this solution result ... as in my previous years of schooling when using magnets I have found that opposite charges attract. Electricity is the flow of negatively charged electrons, when the copper ions come within contact of ...
Subjects: Science Essays > Chemistry
Electric circuit
Aim: To design a simple electrical circuit for Doctor's Surgery to let people know when to enter and also to research and le ... o to research and learn more about parallel and series circuits.IntroductionI am going to design an electric circuit for a Doctor's surgery.There are two types of circuit's Parallel circuit, and Serie ... ies circuit.First I am going to explain what a circuit is and what the differences they have are.An electric current is a flow of charge. The charges are given energy and made of flow using a cell or ...
Subjects: Science Essays > Engineering
Factors affecting the resistance of a wire
affecting the resistance of a wireIntroduction:Resistance is a force, which opposes the flow of an electric current around a circuit.Resistance is measured in Ohms. George Ohm discovered that a circu ... .Resistance is measured in Ohms. George Ohm discovered that a circuit sometimes resists the flow of electricity. He called this 'RESISTANCE.' He even came up with a rule for working out the resistance ...
Subjects: Science Essays
What Is Electrolysis
aving the artefact clean.ElectrolysisIn chemistry, the production of chemical changes by passing an electric current through a solution or molten salt (the electrolyte), resulting in the migration of ... at the cathode receive electrons to form hydrogen gas;ElectrolysisRemoval of unwanted hair using an electric current. It can be very effective in experienced hands, but is slow and therefore expensive.
Subjects: Science Essays > Physics
Electromagnetic Induction
the magnetic field about an electromagnet was made to grow and collapse by closing and opening the electric circuit of which it was a part, an electric current could be detected in a separate conduct ... ggregate of the lines intersecting a given area is called the magnetic flux. Faraday attributed the electrical effects to a changing magnetic flux.The necessity of motion to produce a current is due t ...
Subjects: Science Essays > Physics
The Resistance Of A Wire
the length of the wire.TheoryWhat is resistance?Resistance is a force which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around th ... st the flow of particles if the wires are either very thin or very long.e.g. The filament across an electric light bulb.How is it measured?The resistance of a length of wire is calculated by measuring ...
Subjects: Science Essays > Physics
Human Cloning
e DNA, then you fuse the egg with a cell from the human that you're copying. Then, with the help of electric current, you'll try to stimulate it to divide and become an embryo. You then take implant t ...
Subjects: Science Essays > Genetics & Genome Projects
The Periodicity of Hydrides in Groups 4 to 7
en transition metals and the hydrogen atoms depending on certain factors: temperature, pressure and electric current.When molecules change phases from liquid to gas, enough energy has to be applied to ...
Subjects: Science Essays > Chemistry
Federal Highway System
el-cell and hydrogen research was a boost for the emerging technology, which converts hydrogen into electric current while releasing steam as a byproduct.A few days later, Bush said he wants to see th ... is sitting on the shelf while Detroit dithers. Honda and Toyota are producing (fuel-efficient, gas-electric) hybrid vehicles today, the Big Three are not. Honda has stated that it is using the electr ...
Subjects: History Term Papers > North American History
Working of Electric Filament Heaters:
Appliances that heat up, such as a hair dryer, a clothes iron, toaster, electric toaster oven, or an electric space heater all work on the same idea. They change electrical ... n the same idea. They change electrical energy to heat energy.The devices all plug into a source of electricity. Electric current runs from your wall socket down the wire and into the appliance.Inside ... chromium. It has two features that make it a good producer of heat:Nichrome wire has a fairly high electrical resistance compared to something like copper wire, so even a short length of it has enoug ...
Subjects: Science Essays > Technology