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
Contradictory Impulses in Chopin’s The Awakening “Edna Pontellier could not have told why, wishing to go to the beach with Robert, she should in the first place have declined, and in the second place have followed in obedience to one of the two contradictory impulses that impelled her. A certain light was beginning to dawn dimly within her,--the light which, showing the way, forbids it,” (Chopin 34). The possibility of a life beyond the scope of motherhood, social custom, standards of femininity
remarkable features of Mercury are compressional cliffs or faults, just the sort of wrinkles that might form in the crust if the interior of the planet shrank slightly " (Morrison, 74, 1993). It is speculated that it was the solidification of Mercury's metallic core that caused this global shrinkage. Mercury is also " . . . enriched in metal or depleted of rock " (Morrison, 74, 1993). It is also believed that some of the inner core of Mercury is still in a fluid state. Scientists also believe that Mercury's
gob-stopper and also bares a close resemblance to the internal structure of the Earth; a sphere divided into three layers, differing in density, composition, strength, and state. The densest of these layers is the core, which is composed largely of metallic iron, with small amounts of nickel and other elements². The less dense mantle then covers this layer, being composed of magnesium and iron silicates. The outermost layer is that of the crust, it has the lowest density of all the layers and can be
and easily bent or twisted. It had a metallic surface and was brittle. It was silver in color. A flame from a Bunsen burner was held to the Mg, and it ignited, giving off a brilliant white light. Looking directly into the light resulted in temporary blindness, which would explain the warning on the procedures that strongly suggested not looking directly into the light. After the flame had extinguished itself due to lack of fuel, the Mg had turned from a metallic strip to an off-white powder, which
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