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What is the house earthing?
The term 'house earthing' is used in the electrical wiring of a structure in order to ground the house against electrical leakage which can cause increased power usage and the possibilty of safety concerns involving electrical shock.
Is joules heating always desirable?
Joule heating is referred to as ohmic heating or resistive heating because of its relationship to Ohm's Law. It forms the basis for the myriad of practical applications involving electric heating. However, in applications where heating is an unwanted by-product of current use (e.g., load losses in electrical Transformers) the diversion of energy is often referred to as resistive loss. The use of high voltages in electric power transmission systems is specifically designed to reduce such losses in cabling by operating with commensurately lower currents. The ring circuits, or ring mains, used in UK homes are another example, where power is delivered to outlets at lower currents, thus reducing Joule heating in the wires. Joule heating does not occur in superconducting materials, as these materials have zero electrical resistance in the superconducting state. so it is sometimes desirable and sometimes not............
Do boy have better gross motor or fine motor skills?
As children develop through early childhood boys have much better gross motor skills than girls, and vice versa. Boys are better at play involving throwing balls and physical rough housing, while girls are better at play involving using small objects (such as doll houses) and painting. They also gravitate toward these different types of play as they continue to develop through early childhood, further refining their skills.
What were the names of Nikola Tesla's other cousins?
He had 4 siblings - 1 brother and 3 sisters. When Nikola was about 4 or 5 years old, his brother Dane was killed in an accident involving a horse, leaving him as the only surviving son. Milka, Angelina and Marica Telsa, were his sisters.
Who invent electric motor?
The first electric motors - Michael Faraday, 1821 From the Quarterly Journal of Science, Vol XII, 1821 Faraday Motor from the collection1830's As is so often the case with invention, the credit for development of the electric motor belongs to more than one individual. It was through a process of development and discovery beginning with Hans Oersted's discovery of electromagnetism in 1820 and involving additional work by William Sturgeon, Joseph Henry, Andre Marie Ampere, Michael Faraday, Thomas Davenport and a few others. Using a broad definition of "motor" as meaning any apparatus that converts electrical energy into motion, most sources cite Faraday as developing the first electric motors, in 1821. They were useful as demonstration devices, but that is about all, and most people wouldn't recognize them as anything resembling a modern electric motor. There are several Faraday motors in the collection. The motors were constructed of a metal wire suspended in a cup of mercury (See illustration at right). Protruding up from the bottom of the cup was a permanent magnet. In the left cup the magnet was attached to the bottom with a piece of thread and left free to move, while the metal wire was immobile. On the right side, the magnet was held immobile and the suspended wire was free to move. When current from a Volta pile was applied to the wire, the circuit was completed via the mercury ( a good conductor of electricity) and the resulting current flowing through the wire produced a magnetic field. The electromagnetic field interacted with the existing magnetic field from the permanent magnet, causing rotation of the magnet on the left, or of the wire on the right.
What is a electrical fire?
A non-electrical fire would be one involving combustibles or fuels but does not involve energized equipment.
What is a non electrical fire?
A non-electrical fire would be one involving combustibles or fuels but does not involve energized equipment.
What has the author M J O'Dogherty written?
M J. O'Dogherty has written: 'The shock hazard associated with the extinction of fires involving electrical equipment'
What is a class e fire?
Well a class e fire would be an electrical fire, electrical fires are fires involving potentially energized electrical equipment in Australia. In the U.S. we categorize electrical fires class c.
What is a class C extinguisher tested for?
Fires involving live electrical equipment.
Is a typhoon a chemical change?
No, a typhoon is a physical structure energized by the latent heat of phase changes involving water.
Which of these can be a hazard involving an electrical outlet?
to many electrical cords plugged into one outlet
5 classes of fires?
Yes there are now 5 classes of fire. A, B, C, D, and K... Class A- Ordinary combustibles- paper, plastic, wood, fabric, etc. Extinguished with water or foams. Class B- Flammable liquids- gasoline, oil, kerosene, jet A, etc. Extinguished with foams. Class C- Energized electrical equipment- these become Class A fires when the electrical source to the equipment is disconnected. Then the fire can be extinguished with water, foam, dry-chem, etc. If the equipment is expensive or critical to business operations though, they can be extinguished with carbon dioxide extinguishers. Class D- Flammable Metals- magnesium, aluminum, potassium, etc. Water used to extinguish these fires causes serious problems, akin to using water on a gasoline fire. Dry powders or other smothering agents should be used for extinguishment. Class K- Cooking oil fire- fryer oil, grease, lard, etc. Extinguishment usually provided by saponification systems mounted on overhead vents or near fryer units. Saponification uses a solution that basically turns the grease/oil into a soapy substance and smothers the fire. Different from foam, but similar.
What is corporators?
involving or associated with a corporation
What is class c fire?
Any fire involving live electrical components, such as an electric motor, transformer, or switchgear. Here is a way to remember- A- burning solids- leaves ASH B- Liquids- the BOIL C- Electrical CURRENT D- flammable metals- they DENT
What level of civilian chemical equipment are used during an incident involving an unknown hazardous substance?
Level B of civilian chemical equipment are used during an incident involving an unknown hazardous substance.
What fires does a sand bucket extinguish?
A sand bucket is best suited for extinguishing small fires caused by flammable liquids, paper, wood, and electrical equipment. It is not effective for extinguishing fires involving cooking oils, grease, or electrical systems.
