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Topic: Power (physics)

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In the News (Fri 17 Nov 17)

  Power (physics) - Wikipedia, the free encyclopedia
The power consumption of a human is on average roughly 100 watts, ranging from 85 W during sleep to 800 W or more while playing a strenuous sport.
The average power consumed by a sinusoidally-driven linear two-terminal electrical device is a function of the root mean square (rms) values of the voltage across the terminals and the current passing through the device, and of the phase angle between the voltage and current sinusoids.
The ratio of the pulse duration to the period is equal to the ratio of the average power to the peak power.
en.wikipedia.org /wiki/Power_(physics)   (973 words)

 Power - Wikipedia, the free encyclopedia
Power (physics) is the amount of work done or energy transferred per unit of time.
In optics, the optical power of a lens is the inverse of its focal length.
Reserve power, a power that may be exercised by the head of state of a country in certain exceptional circumstances.
en.wikipedia.org /wiki/Power   (407 words)

 The Physics Classroom
Power is the rate at which work is done.
The standard metric unit of power is the Watt.
As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time.
www.physicsclassroom.com /Class/energy/U5L1e.html   (1153 words)

 Guardian Unlimited | Science | Fuel's paradise? Power source that turns physics on its head
The problem is that according to the rules of quantum mechanics, the physics that governs the behaviour of atoms, the idea is theoretically impossible.
What has much of the physics world up in arms is Dr Mills's claim that he has produced a new form of hydrogen, the simplest of all the atoms, with just a single proton circled by one electron.
He turned back to earlier classical physics to develop a theory which, unlike quantum mechanics, allows an electron to move much closer to the proton at the heart of a hydrogen atom and, in doing so, release the substantial amounts of energy he seeks to exploit.
www.guardian.co.uk /science/story/0,3605,1627424,00.html   (1226 words)

 power - Search Results - MSN Encarta
Electric Power Systems, components that transform other types of energy into electrical energy and transmit this energy to a consumer.
Power (mathematics), term used to describe the result of repeatedly multiplying a number by itself.
Power (physics), in physics and engineering, the rate of performing work or transferring energy.
ca.encarta.msn.com /power.html   (141 words)

In the UK the maximum amount of power permitted when transmitting is 400w, but not on all bands.
If you do not know how much power you are using, you might be in breach of the terms and conditions of your license, in which case you will lose your license.
I suppose this is how much power a horse is using when it pulls a cart load of beer from the brewery to the pub.
www.purchon.com /physics/power.htm   (794 words)

 Power   (Site not responding. Last check: 2007-10-22)
Determine the average power generated by such an adult (assuming he or she is not gaining or losing weight).
This athlete had an average power of 390 W and a maximum power of 1900 W (approximately ½ and 2½ horsepower, respectively).
Although it is incredibly powerful, the Petawatt is not particularly energetic.
hypertextbook.com /physics/mechanics/power/index.shtml   (1886 words)

 Do we need nuclear power? (June 2001) - Physics World - PhysicsWeb
The subsidies for nuclear power over the past five decades have been colossal - about a hundred times the amount we have spent on developing renewable energy, for example - and further immense subsidies will be required to deal with the legacy of nuclear wastes and the decommissioning of power stations.
It is true that nuclear power makes a sizeable contribution to energy supplies in France and the UK, and that global production grew from near zero to the equivalent of 630 million tonnes of oil (toe) per year between 1960 and 2000.
Although many new gas-fired power stations, which emit only half as much carbon dioxide as coal-fired power stations, are currently being built, the problem is that they leak methane, which has a "global-warming potential" of about 60 times that of carbon dioxide.
physicsweb.org /articles/world/14/6/2/1   (3331 words)

 Physics of Power   (Site not responding. Last check: 2007-10-22)
Focus is not just terminating the technique at the point in space, it is also a simultaneous contracting of all muscles to add all the power and mass of the body to the technique.
Without the contraction, maximum power is not reached, therefore, if an opponent moves into a technique that was intended to stop just short of contact, the attacker can lessen the force of the impact by not contracting into the technique.
The large person has bigger muscles and more mass, but it requires more muscle power to move the greater mass so acceleration and velocity of the punch is reduced.
tkdtutor.com /06Theory/Power/PowerPhysics.htm   (1858 words)

 Power (physics) - LearnThis.Info Enclyclopedia   (Site not responding. Last check: 2007-10-22)
Non-SI units of power include horsepower (HP), Pferdestärke (PS) and the cheval vapeur (CV).
This figure can also be called the effective power, as compared to the larger apparent power which is expressed in volt-amperes reactive (VAR) and does not include the term due to the current and voltage being out of phase.
For simple domestic appliances, the "cos φ" term (called the power factor) can often be assumed to be unity, and can therefore be omitted from the equation.
encyclopedia.learnthis.info /p/po/power__physics_.html   (481 words)

 Nobelist Creates Films on Solar Power - Physics Today May 2006
The film tours the history of solar power, from the controversy over the wave and particle theories of light to the first solar-powered batteries made at Bell Labs in 1954 to current developments on solar panels.
Interviews with researchers guide the audience through the science and show some of the ways solar power is used today, such as on satellites and other spacecraft, in lighting at remote airports, and for cooling the vaccines carried by camels through the desert.
The Power of the Sun was the brainchild of solar energy historian John Perlin and Walter Kohn, a Nobel laureate in chemistry at the University of California, Santa Barbara, some of whose work is related to solar materials.
www.physicstoday.org /vol-59/iss-5/p26b.html   (492 words)

 The Physics of Everyday Stuff, by Sam Hokin
The MKS unit of energy is the joule (J) and the MKS unit of electric charge is the coulomb (C), which is the amount of charge that flows by in one second if the current is one amp.
That's about as high a power as home appliances go, and this is not too far from tripping a 15 A circuit breaker, standard in modern US houses.
Power loss due to wire resistance increases as the square of the current and therefore decreases as the square of the voltage at fixed total power.
www.bsharp.org /physics/stuff/xmission.html   (1075 words)

 Power of a Human
Physics and Astronomy at the University of Missouri-St. Louis.
This means that he or she uses up energy at a rate of (power) of 2500 kilocalories/day.
When people refer to how much "power" they have, it is normal to assume they mean how much "authority" they have.
hypertextbook.com /facts/2003/WeiLiangMok.shtml   (422 words)

 ASEE - Naval Research Laboratory Postdoctoral Fellowship Program - Plasma Physics - Code 6700   (Site not responding. Last check: 2007-10-22)
Areas of study include (1) physics of solar eruptive phenomena,(2) heliospheric processes, (3) large-scale simulations of the solar wind-magnetosphere-ionosphere system, (4) plasma instabilities and anomalous transport processes in the magnetospheric and ionospheric plasmas, (5) particle acceleration processes, (6) magnetic reconnection, (7) active experimentation in space, and (8) nonlinear dynamics and chaos in space plasmas.
Power flow in such systems is also being studied, including the effects of magnetically insulated electron flow in transmission lines and coupling to loads.
Examples of space physics experiments include (1) ion cyclotron wave generation and ion heating due to velocity shear-generated instabilities, (2)space vehicle charging/discharging in variable plasma and neutral gas environments, and (3) laboratory studies of in situ plasma diagnostic probes and measurement techniques.
www.asee.org /resources/fellowships/nrl/nrl-6700.cfm   (3676 words)

 physics central physics in the news - moon power   (Site not responding. Last check: 2007-10-22)
The system can be built on the moon from lunar materials and operated on the moon and on Earth using existing technologies,” reducing the expenses associated with transporting materials to the moon.
The LSP system consists of 20-40 lunar power bases, situated on the eastern and western edges of the moon, as seen from Earth.
Each power base has a series of solar cells to collect energy from the sun, which is sent over buried electric wires to microwave generators that convert the solar electricity to microwaves.
www.physicscentral.com /news/news-02-5.html   (443 words)

 power - Wiktionary
(physics) A measure of the rate of doing work or transferring energy.
(physics) A rate to magnify an optical image by a lens or mirror.
In the face of expanding federal power, California in particular struggled to maintain control over its Chinese population.
en.wiktionary.org /wiki/power   (333 words)

 Sam's Laser FAQ - Complete Ar/Kr Ion Laser Power Supply Schematics
Unlike a power supply using a linear regulator where power dissipation is huge and proportional to the difference between the rectified/filtered line voltage and the tube voltage, and even thinking about this would be out of the question.
Powering this unit should be even easier than the model 2214 since in addition to no requirement for a boost supply, the starting is automatic so there is not even any need for an external enable signal.
With power applied, the red Power LED and green Interlock LED should be lit and the filament of the tube should heat up for 20 to 30 seconds before the starter is activated.
repairfaq.cis.upenn.edu /sam/laserasc.htm   (18815 words)

 BlackLight Power Incorporated
Having exactly solved the atom using physical laws for the first time, BlackLight is the primary mover in advancing applications of a new chemical process of releasing the latent energy of the hydrogen atom, the BlackLight Process.
This generates power as heat, light, and plasma (a hot, glowing, ionized gas) with the formation of strong hydrogen products that are the basis of a vast class of new chemical compounds with broad commercial application.
The process is scalable from small, hand-held units to large, fire-box replacements in large central power stations.
www.blacklightpower.com   (479 words)

 Health Physics/Radiation Protection (last revision Jan 5, 2000)
Health physics is devoted to protecting people and the environment from radiation hazards, while making it possible to enjoy the benefits of the peaceful use of the atom.
The power reactor health physicist must be ready to respond quickly and with expertise in the unlikely event of a radiation accident.
It is common for a power reactor health physicist to supervise as many as 70-80 technicians and professionals, such as chemists and radiochemists.
biology.unm.edu /Potter/Careers/HTML/C32Healt.html   (1222 words)

 Wave Power Research, Physics, NTNU   (Site not responding. Last check: 2007-10-22)
In December 1973 the university teacher ("førsteamanuens") Kjell Budal (1933-1989) initiated the wave energy research at the Department of Physics, Norwegian Insitute of Technology NTH, University of Trondheim (after 1995: Norwegian University of Science and Technology NTNU).
Wave energy is one of several subjects contained in the course Physics and Energy, which has been taught every year since 1974, when Jørgen Løvseth initiated the course, at the College of Arts and Science (AVH), University of Trondheim.
The paper, which presents a review of the research carried out during the twenty years after 1973 on optimum control of wave-power devices in order to maximise the power output, is aimed at specialist readers, although only a minimum of mathematics is used.
www.phys.ntnu.no /instdef/prosjekter/bolgeenergi/index-e.html   (1075 words)

 petrolpump.co.in : energy sources, Electric power, Electricity generation Electric power transmission,Electricity ...
Electric power, often known as power or electricity, involves the production and delivery of electrical energy in sufficient quantities to operate domestic appliances, office equipment, industrial machinery and provide sufficient energy for both domestic and commercial lighting, heating, cooking and industrial processes.
With Tesla and his patents, Westinghouse built a power system for a gold mine in Telluride, Colorado in 1891, with a water driven 100 horsepower (75 kW) generator powering a 100 horsepower (75 kW) motor over a 2.5-mile (4 km) power line.
Today, Tesla's alternating-current electric power system is still the primary means of delivering electrical energy to consumers throughout the world.
www.petrolpump.co.in /energy-sources/electric-power.htm   (784 words)

 SparkNotes: SAT Physics: Energy, Power, and Heat
Ohm’s Law and the formula for power express fundamental relationships between power, current, and voltage, and between voltage, current, and resistance.
When electric companies determine how much to charge their clients, they measure the power output and the amount of time in which this power was generated.
Note that the kilowatt-hour, as a measure of power multiplied by time, is a unit of energy.
www.sparknotes.com /testprep/books/sat2/physics/chapter14section4.rhtml   (502 words)

 Power (physics) Encyclopedia @ Encyclopedia.LocalColorArt.com (Local Color Encyclopedia)   (Site not responding. Last check: 2007-10-22)
Power (physics) Encyclopedia @ Encyclopedia.LocalColorArt.com (Local Color Encyclopedia)
Average electrical power for AC The formula works for any waveform, periodic or otherwise, that has a mean square; that is why the rms formulation is so useful.
Interactive Power Conversion Table - convert selected unit to all other units of power
encyclopedia.localcolorart.com /encyclopedia/Power_(physics)   (707 words)

 Physics project captures wind power, imagination   (Site not responding. Last check: 2007-10-22)
While the contraption generated more looks than power, two Elk River High School seniors used the propeller and a 1930s Zenith radio generator to prove the usefulness of wind power as well as complete a physics assignment.
The assignment was to prove a concept of physics while benefiting the community.
Even though the project did not produce a direct community benefit, Beers believes it teaches the pollution-free power of the wind, she said.
www.anokacountyunion.com /2002/May/2wind.html   (329 words)

 Articles - Power (physics)   (Site not responding. Last check: 2007-10-22)
:´´P(t)´´ is the instantaneous power, measured in watts
The peak power is not always readily measurable, however, and the measurement of the average power
In optics, the term ´´power´´ sometimes refers to the average rate of energy transport by electromagnetic radiation.
www.seekj.com /articles/Power_(physics)   (849 words)

 Funding US Nuclear Power Plants - Physics Today February 2006
The early commercial nuclear plants were built with direct federal subsidies and loan guarantees; an example is the Yankee Rowe nuclear power plant built in 1960 under the Atomic Energy Commission's power-demonstration reactor program.
Plants already under construction were stymied by new requirements that caused tremendous uncertainty both in building and in the actual start-up of power production.
Given the way governmental entities contributed to the problems of past nuclear power plant construction, it is only fitting that the federal government share substantially in the investment risk.
www.physicstoday.org /vol-59/iss-2/p11a.html   (412 words)

 Stronger Future for Nuclear Power - Physics Today February 2006
Some two dozen power plants are scheduled to be built or refurbished during the next five years in Canada, China, several European Union countries, India, Iran, Pakistan, Russia, and South Africa.
The new reactors are supposed to be inexpensive to build, more powerful, and safer; and they can be operated for up to 60 years, according to nuclear-power trade groups.
The US nuclear power industry has been virtually frozen since the Three Mile Island accident in 1979, but in the US Congress 2005 energy bill, tax credits worth $3.1 billion, along with liability protection and compensation for legislative delays, were added for the industry.
www.physicstoday.org /vol-59/iss-2/p19.html   (987 words)

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