answer the question 'Is A Filament Bulb an Ohmic Resistor' I needed to know what an ohmic resistor was. OHM'S LAW The current flowing through a metallic conductor is proportional to the potential difference. This is only true when the temperature is constant. If you read the current as you change the potential difference across a conductor the ratio V/I (volts over amps) is the same if it is ohmic. From digitalbrain.com --------------------- An ohmic resistor is a component in
is affected by the length of the wire. Theory What is resistance? Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. it has less resistance. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons are given energy and as a result move and collide with neighbouring free electrons. This
affected by the length of the wire. Theory What is resistance? Electricity is conducted through a conductor, in this case wire, by means of free electrons. The number of free electrons depends on the material and more free electrons means a better conductor, i.e. it has less resistance. For example, gold has more free electrons than iron and, as a result, it is a better conductor. The free electrons are given energy and as a result move and collide with neighbouring free electrons.
Nickel is one of the most important elements on the periodic table. It has plenty of history, as well as a huge importance to society. Its has unique chemical, physical, and geological properties. Nickel is used commercially in abundance, as it is used anywhere from simple art products such as ceramics to complex structures such as tubing for desalination plants. It is even used in the American five-cent coin, the "nickel".Nickel was discovered by Axel Fredrik Cronstedt, in Sweden, during the year
Aluminum, symbol Al, the most abundant metallic element in the earth's crust. The atomic number of aluminum is 13; the element is in group 13 (IIIa) of the periodic table. Hans Christian Orstead, Danish chemist, first isolated aluminum in 1825, using a chemical process involving potassium amalgam. Between 1827 and 1845, Friedrich Wöhler, a German chemist, improved Oersted's process by using metallic potassium. He was the first to measure the specific gravity of aluminum and show its lightness. In
Ceramics - Incredible Refractory Materials Introduction First we will start with the definition of refractories and ceramics. Refractories and ceramics are non-metallic materials capable of maintaining physical and chemical stability at high temperatures. Refractories in modern practice are usually ceramic in nature, and are used in a wide variety of primary, secondary and tertiary industries. Wherever an industrial process involves heat in excess of 700 to 800 degrees Fahrenheit (roughly), one
Electrical Resistance Electrical resistance is a property of an electrical circuit that opposes the flow of current. Resistance involves collisions of the current-carrying charged particles with fixed particles that make up the structure of the conductor. Resistance is often considered as localized in such devices as lamps, heaters and resistors in which it predominates, although it is a characteristic of every part of a circuit, including connecting wires and electric transmission lines. In
resistance of a wire can be expressed as: [IMAGE] There are a few things that determine the current produced; * In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. Conductor implies that the outer electrons of the atoms are loosely bound and free to move through the material. Most atoms hold
One of its purest forms is diamond. Diamond is the hardest substance known on earth. Although diamonds found in nature are colorless and transparent, when combined with other elements its color can range from pastels to black. Diamond is a poor conductor of heat and electricity. Until 1955 the only sources of diamond were found in deposits of volcanic origin. Since then scientists have found ways to make diamond from graphite and other synthetic materials. Diamonds of true gem quality are not made
to reduce into carbon monoxide. This reaction absorbs some heat and lowers the temperature of the upper part of the furnace to roughly 1300° C. CO2(g) + C(s) + heat ® 2CO(g) This carbon monoxide then reduces the iron oxide to a metallic iron, which is molten at the temperature of the reaction. This takes place in middle and upper parts of the furnace. 3CO(g) + Fe2O3(s) ® 2Fe(l) + 3CO2(g) The limestone in the charge is to remove any existing silica left in
The Molten Core Theory The center of the Earth is composed of a solid metallic core surrounded by a molten layer of liquid metal. This paper will discuss the reasons to believe the theory that the Earth has a molten core, and the important discoveries that have led to this generally accepted theory. It is very reasonable to agree with this theory when paying credence to the logical evidence that answers questions about the Earth’s core. This evidence includes information about the elemental
Plutonium Plutonium is a radioactive metallic element. Although it is occasionally found in nature, mostly all of our plutonium is produced artificially in a lab. The official chemical symbol for plutonium is Pu, coming from its first and third letters. Its atomic number is ninety-four. Plutonium is able to maintain its solid state until very high temperatures, melting at six hundred and forty degrees Celsius, and boiling at three thousand four hundred and sixty degrees. The density of Plutonium
leave you rich if you choose to invest. The prospect of wealth relies on superconductors- the system of the future and present. You could earn millions by contributing to the research of superconductors. Superconductors consist of an element, inter-metallic alloy, or compound that will conduct electricity without resistance (loss of energy flowing through the material) below a certain temperature. Once in motion, electrical current will flow forever in a closed loop of superconducting material, hence
fresh, spontaneous, and uniquely hip compared to the 1950's architectural style adopted by its neighboring buildings which line the streets of downtown Hartsville. I briefly pause amid several small, circular stainless steel tables and matching metallic armchairs which cover the sidewalk in front of the shop and notice a familiar looking figure sitting in one of the three chairs in front of the right window. The petite young woman dressed in khakis and a black sweater appears relaxed with her
Sodium (Na) Sodium has an atomic number of 11 and a mass of about 23g. It is a silvery white-metallic element classified under the alkali metals. Sodium has been known since early times and was used by the people of Mesopotamia and Egypt to make glasses. Sodium is the sixth most common element found on the earth. It is usually not found in nature but more often in compounds such as salt (NaCl). Sodium conducts heat and electricity easily. Without this element life could not exist. Each compound
gloomy house. The vivid colors and visuals in the story not only force the reader to picture the surroundings in his or her mind, but also contain the hidden connotations of gravity and despair. The inclusion of sounds, like the "distinct, hollow, metallic, and clangorous, yet apparently muffled reverberation," (Poe 27) and aural references to musical instruments, such as the lute quote by De Béringer suggests that the reader experience the mood of the tale in a more auditory and sensory appealing
bacteria’s ability to ferment lactose. This test is accomplished by placing the bacteria on Eosin Methylene Blue agar. The agar is selective for gram negative bacteria and those bacteria that can ferment lactose will have colored growth, usually a metallic green sheen. The Sulfur Indole Motility agar tests for three separate characteristics; sulfur reduction, indole production, and motility. The SIM medium is a semisolid medium; this facilitates the motility test. The medium contains sulfur, if
(anode). On reaching the electrodes, the ions may gain or lose electrons and be transformed into neutral atoms or molecules. The copper ions move to the cathode and are discharged by gaining electrons, and are deposited on the electrode as metallic copper, Equation Cu+2 + 2e- èCu (Reduction) The chloride ions move to the anode and are discharged, by losing electrons, as chlorine gas. Equation 2Cl-1è Cl-1 + 2e-(Oxidation ) [IMAGE] Here is a diagram to show the ions going to the
minds. Some combination of the five senses is used to conduct information, so art may take the form of music, painting, sculpture, dance, and others. Art may be collaborative, as with the presentation of a symphony, which may involve a composer, a conductor, players, and a lighting crew all working to create the art of the presentation. Also, art occurs in at least one level of abstraction removed from reality, a representation of the real thing. There is no requirement of beauty in art. Indeed
is being passed on to the metal cup over most of its inner surface. 2. CONDUCTION - the metal cups will get hotter as a result of the heat energy inside the cup. The water will pass on this heat energy due to the fact that metal is a good conductor of heat. The heat energy will be conducted throughout the metal cup to the outer surface where it will be transferred to the air around the cup as radiation. 3. RADIATION - hot objects (i.e. the metal cup) emit mainly INFRA-RED radiation, and