Summary of Foreign Commerce of the United States. United States. Bureau of the Census. Accompanied by annual issue in and by quarterly cumulative issues beginning in All articles exported shall be valued at their actual cost. Animals and animal products, edible.
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Last updated: October 31, D o you ever hear people talking about using a sledgehammer to crack a nut? Using too much force where only a little would do is obviously a waste of energy —but it's something we all do, all the time, where electricity is concerned.
Broadly speaking, voltage is the electrical equivalent of force and we often power electrical appliances and gadgets with far more volts than they actually need. Using an "electric sledgehammer" to crack an electrical nut wastes money as well as energy and can dramatically shorten the life of expensive equipment. If you're running something like a factory with lots of huge machines powered by electric motors , using too much voltage might be adding an unnecessary 10—20 percent to your electricity bill; multiply that across the whole of the industrial world and you get a big problem that's bad for the economy and bad for the planet.
One solution is to use voltage optimization equipment also known as voltage correction, stabilization, or reduction , which constantly regulates your electricity supply so you get precisely the voltage you need. Let's take a closer look at how it works!
Photo: The concept of voltage optimization: it converts power-line waves of different shapes and sizes into ones of just the right shape and size to run your equipment more efficiently.
Ever noticed that all the little gadgets and gizmos you have around the house use slightly different voltages of electricity? Your big appliances are all designed to run off the household supply, typically volts or volts depending on where in the world you are. But the smaller gadgets will use all kinds of different voltages. A flashlight will use about 3 volts, a digital camera 4 volts, a cellphone or CD player 6 volts, a laptop about 20 volts, and so on.
Ever wondered why bigger appliances need more? Think voltage, think force: broadly speaking, you need a bigger voltage to force an electric current through something like the electric motor in a refrigerator or a vacuum cleaner than through the tiny little filament lamp in a flashlight or the microchips in your laptop. You need a bigger sledgehammer to crack a bigger nut. Another way of thinking about this is to remember that the amount of power something electrical uses is proportional to its voltage.
If you need an electrical appliance to make your life easy by doing something that requires lots of energy like trimming your hedge or tumble-drying your jeans , it's also going to need lots of energy putting into it each second—and that means plenty of voltage.
In theory, you could power a tumble dryer with a 1. A volt or volt dryer will do the job properly and much faster, but it won't necessarily make any difference if your household power is actually volts or volts. Photo: Power plants are designed to produce reasonably constant voltages with voltage regulators, ammeters, wattmeters, synchroscopes which keep power generators in sync with one another and the power grid they're connecting to , and much more.
Once electricity leaves a power plant , utility companies have little or no idea what we're actually doing with it.
They just give us all the same basic supply and let us get on with it. In practice, industrial users will get much higher voltage supplies than homes so they can drive powerful factory machines but, even so, there is only a relatively crude link between the voltage that's supplied and the voltages we actually use. The mismatch between these two things can be a big problem and a huge waste of energy and money. Most electrical machines are made and sold internationally and have to work on different voltages in different countries.
An electric lathe factory cutting machine might be manufactured in Germany to work right across Europe a huge swathe of the world on voltages ranging from — volts: in Germany, it'll happily work on volts; in the UK, it'll work just the same no faster or better on a national supply that's sometimes closer to volts—but the higher voltage will make it waste about 10 percent more energy by getting considerably hotter potentially reducing its useful life quite significantly.
If you're using that machine in the UK, you might wish your electricity supply were volts instead of This problem is often referred to as overvoltage. Chart: Voltages around the world: As all travellers know, electricity supply voltages vary around the world, though generally there are just two common bands: roughly — volts for North America and the Pacific and — volts elsewhere.
That's obviously a problem for manufacturers who want to make products for the global market, but less of a problem in a single continent, such as Europe, where voltages have been standardized. Source: Mains electricity by country double-checked with a second source. There are some other issues to worry about too. The voltage your building receives can rise and fall quite dramatically from hour to hour even from minute to minute or second to second due to fluctuations in demand and supply.
If a factory is turning big electric machines on and off in your neighborhood, for example, that can lead to transients brief spikes in power that can affect other buildings nearby. Spikes sometimes called surges and sags sometimes called dips can also be caused by lightning strikes, power generating equipment going on- or offline, and lots of people all using electricity at once cooking at the same time each evening, for example.
In practice, a supply that is supposed to be volts could be fluctuating regularly by as much as 10 percent or more, giving you an actual voltage anywhere from about — volts. And it's not just the voltage that can vary. In theory, most electricity is supplied as an alternating current AC sine wave , which rises, falls, and reverses direction smoothly something like times a second the ordinary supply frequency.
In practice, AC supplies can also include irregular, higher-frequency waveforms called harmonics that potentially damage delicate equipment by causing overheating and really need to be filtered out. Photo: Ideally, alternating current should vary smoothly in this up-and-down sine-wave pattern.
In practice, it can change more drastically and erratically, harming your equipment. As householders, we don't mind all this too much; most of us aren't even aware of the problem. And maybe you have surge protectors fitted to a few key appliances like your computer or your wireless router to safeguard against spikes and lightning strikes. If you're running a business, the mismatch between the voltage you're supplied with and the voltage you need is much more of an issue: it's costing you a great deal of money you don't actually need to spend.
Photo: Electronic household gadgets that use low voltages typically have small transformers built into their power cords. These all run off the European power supply of volts or so, but actually supply much smaller voltages to the appliances they power. Clockwise from the top: transformers for a modem 18 volts , a cellphone charger 5. There are two main ways to solve the problem. The first is to have your own, simple step-down transformer also called a voltage-reducing or "tap-down" transformer to change a higher incoming voltage to a lower level more in line with what you actually need.
Factories and offices with their own dedicated substation or transformer effectively have this option already; they can simply readjust what's called the "tap setting" the ratio between the incoming and outgoing voltage so their transformer supplies a lower voltage than before. Alternatively, an extra step-down transformer can be added to reduce the voltage from the outside electricity supply to one that more closely matches what's needed by the building's internal electricity system.
The trouble with this approach is that it solves only the problem of overvoltage. If you're sometimes getting too little voltage from the supply a problem also called "undervoltage" or "brownout" , altering the tap setting to reduce overvoltage will make matters worse.
Photo: A step-down transformer like this one which is supplying my electricity as I type this reduces the high-voltage power from electricity cables into a lower voltage for homes and factories. Adjusting the tap settings will make it produce a higher or lower output voltage from the same input voltage.
A better solution is to use dedicated voltage optimization equipment that constantly adjusts the voltage from the supply, either increasing or decreasing it so it remains within a narrowly defined band.
Devices that do this are called voltage regulators , voltage optimizers, voltage stabilizers, or voltage correctors. They need no maintenance or monitoring and work happily for many years without replacement. They also filter out spikes and harmonics to give a smoother power supply all round. Voltage regulators can work in a variety of different ways.
Some are based on ferroresonant transformers also called constant voltage transformers or CVTs , which are like ordinary transformers but with an extra component an inductor, based on a capacitor and resonating coil built into their secondary winding. Normally the primary the "input" and secondary the "output" of a transformer are coupled so any changes to the primary voltage are directly reflected in the secondary: if the primary voltage rises, the magnetic flux induced in the core of the transformer rises and the secondary voltage rises too by a corresponding amount.
The extra circuitry in a ferroresonant transformer keeps the magnetic flux of the secondary section of the transformer at a constant and maximum value, whatever happens to the flux in the primary. That ensures the transformer gives a more or less constant output voltage usually fluctuating by percent even if the input voltage varies slightly.
Other voltage regulators work a different way. The simplest ones are essentially electronic. They work by constantly measuring the voltage of the waves that make up the incoming electricity supply and comparing them with the voltage you say you want.
If there is too much voltage, they add a second wave of just the right size, in antiphase with the original, to subtract exactly the right amount of voltage. So if your incoming supply rises to volts and you'd set the regulator to volts, it will add an upside down waveform equivalent to 30 volts to the volts, subtracting just enough power to make volts.
If the supply dips to volts, the corrective voltage will immediately dip to 20 volts, keeping the output steady at volts. A voltage regulator is usually a more expensive solution than a simple step-down transformer, but it can save half as much energy again, giving overall energy savings of percent. Although large units cost thousands of dollars or pounds, typically, they pay for themselves in years in lower energy and maintenance costs and by extending the life of the electrical equipment they're connected to.
They also have a payback for the planet: by cutting your energy consumption, they're helping you make a positive contribution to tackling environmental problems such as climate change. Photo: You might think all your household electrical appliances are running off a volt or volt supply, but many of them secretly transform that voltage to something else without your knowing. A little circuit like this is built into the base of modern energy-saving fluorescent lamps also called compact fluorescents or CFLs.
It boosts the frequency of the supply so the lamp can be small, bright, and compact and so it doesn't flicker. Voltage optimization equipment is sophisticated and used to be beyond the budget of all but big businesses and industry. But small, vastly scaled-down versions of the same basic equipment are now being mass-produced for ordinary householders. One small voltage optimization gadget, manufactured by VPhase, promised to reduce household electricity supply from volts potentially fluctuating from volts to a more consistent level around, say, volts, offering a potential saving of 10 percent on electricity bills.
Smaller voltage optimization units typically don't protect against transients and harmonics, however and they have been criticized by consumer group Which? Ultimately, there are simpler, cheaper, and quicker ways of reducing your household energy bills, some of which like turning down your thermostats very slightly don't cost anything at all. Same output, lower input—voltage optimization sounds too good to be true. Indeed, it sounds like it violates one of the most basic laws of physics: the conservation of energy.
According to that law, you can't make energy out of thin air or get more energy out of something than you put in. So if you reduce the energy going into an appliance, aren't you going to get less energy out? Or, to put it another way, if voltage optimization lowers the voltage, doesn't it make something like an industrial motor slower and less effective? Won't it make something like a refrigerator or an air conditioner less effective at cooling? Won't it make your lights dimmer?
The answer is sometimes yes, sometimes no. Remember overvoltage , which we introduced above? If you supply something like a motor with more voltage than it needs, it doesn't spin any faster: it just wastes the extra energy as heat.
Reduce the voltage and you reduce that wasted heat before you reduce the useful energy that turns the motor. In other words, if you run the motor at its ideal, lower voltage, you make it more efficient.
The energy you save in this way is energy you're not drawing from the power supply, so it translates into a financial saving for you and an environmental benefit for the planet.
It's worth remembering that if you run appliances with too much voltage or current, they'll wear out significantly more quickly. Extending the lives of electrical appliances also translates into financial and environmental benefits. Now it's worth pointing out that if you cut the voltage too much, you are bound to reduce the output of whatever appliance you're powering: the conservation of energy tells us that must be the case.
Consider an extreme example and this is intuitively obvious: you cannot run a volt domestic refrigerator with a 1.
Been in Shenzhen the past two weeks, trying to beat Chinese New Year deadlines, improve my Chinese, and learn more about manufacturing and supply chains. So far, so good. Will have more updates soon! This entry was posted on Saturday, January 31st, at pm and is filed under name that ware.
Contact us for BIG Discounts on large orders. Three-phase electric power is a common method of electric power transmission. It is a type of polyphase system mainly used to power motors and many other devices. A three-phase system uses less conductor material to transmit electric power than equivalent single-phase , two-phase, or direct-current systems at the same voltage. In a three-phase system, three circuit conductors carry three alternating currents of the same frequency which reach their instantaneous peak values at different times.
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Last updated: October 31, D o you ever hear people talking about using a sledgehammer to crack a nut? Using too much force where only a little would do is obviously a waste of energy —but it's something we all do, all the time, where electricity is concerned. Broadly speaking, voltage is the electrical equivalent of force and we often power electrical appliances and gadgets with far more volts than they actually need. Using an "electric sledgehammer" to crack an electrical nut wastes money as well as energy and can dramatically shorten the life of expensive equipment. If you're running something like a factory with lots of huge machines powered by electric motors , using too much voltage might be adding an unnecessary 10—20 percent to your electricity bill; multiply that across the whole of the industrial world and you get a big problem that's bad for the economy and bad for the planet. One solution is to use voltage optimization equipment also known as voltage correction, stabilization, or reduction , which constantly regulates your electricity supply so you get precisely the voltage you need. Let's take a closer look at how it works!
Three-Phase Electric Power
Explore our publications to find out about our internationally recognised research which is creating an impact across the world. Many of our researchers make their full text freely available to view and share, to support the free exchange of knowledge and ideas. World leading research, strong links with industry, and a friendly and supportive teaching environment make us one of the leading engineering schools in the UK.
Public procurement localisation. On October 24, the Pennsylvania state legislature enacted a bill H. The amendments, which took effect sixty days after enactment, provided for a new exception to the Steel Products Procurement Act 73 P. Seq that was originally enacted in That law requires every public agency to include in its contracts for construction, reconstruction, alteration, repair, improvement or maintenance of public works a provision that, if any steel products are to be used or supplied in the performance of the contract, only products made from U. The term 'public agency' is broadly defined and includes, for example, Commonwealth agencies, counties, cities, municipalities, school districts, authorities and other public bodies. The amendments provide for the creation by the Pennsylvania Department of General Services an official list of steel products that are not produced in the United States in sufficient quantities. The second exception states that the requirement to use steel products made from U. The Department also published an initial list of the exempt steel products in the Pennsylvania Bulletin 43 Pa. Units Wall Mtd.
1.5mm & 2.5mm electrical cable calculation
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MERSEN | Global expert in electrical power and advanced materials
Bachelor's Degree Programme Electrical Engineering. Language 2.
Electrical Safety Precautions and Basic Equipment
An electroencephalogram EEG machine is a device used to create a picture of the electrical activity of the brain. It has been used for both medical diagnosis and neurobiological research.
In cases where these groupings correspond with major groups, the major group heading is also in italics. The assembly of products from component parts is considered to be Manufacturing, except in cases where the activity is appropriately classified under Construction. The assembly and installation of machinery and equipment in mining, manufacturing, commercial and other business establishments is classified under the same group of Manufacturing as the manufacture of the item installed.
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