If you can build a website, you can build a desktop app. It takes care of the hard parts so you can focus on the core of your application. Watch the video. Electron uses Chromium and Node. Electron is an open source project maintained by GitHub and an active community of contributors. Compatible with Mac, Windows, and Linux, Electron apps build and run on three platforms.
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This is why the chemical symbol for copper is Cu. Copper has many extremely useful properties, including:. See below for more information on each of these properties, and how they benefit us in our daily lives. A good electrical conductivity is the same as a small electrical resistance. An electric current will flow through all metals, however they still have some resistance, meaning the current needs to be pushed by a battery in order to keep flowing.
The bigger the resistance, the harder we have to push and the smaller the current is. Current flows easily through copper thanks to its small electrical resistance, without much loss of energy. This is why copper wires are used in mains cables in houses and underground although overhead cables tend be aluminium because it is less dense. However, where size rather than weight is important, copper is the best choice. Thick copper strip is used for lightning conductors on tall buildings like church spires.
The copper strip has to be thick so that it can carry a large current without melting. Copper wire can be wound into a coil. Copper coils can be found in:. How copper conducts Copper is a metal made up of copper atoms closely packed together. If we could look closely enough, we would see that there are electrons moving about between the copper atoms. Each copper atom has lost one electron and become a positive ion.
So copper is a lattice of positive copper ions with free electrons moving between them. The electrons are a bit like the particles of a gas that is free to move within the surfaces of the wire. The electrons can move freely through the metal. For this reason, they are known as free electrons. They are also known as conduction electrons, because they help copper to be a good conductor of heat and electricity.
The copper ions are vibrating see Figure 1. Notice that they vibrate around the same place whereas the electrons can move through the lattice. This is very important when we connect the wire to a battery. Figure 1 — A copper wire is made of a lattice of copper ions. There are free electrons that move through this lattice like a gas. We can connect a copper wire to a battery and a switch.
Normally, the free electrons move about randomly in the metal. When we close the switch, an electric current flows. Now the free electrons flow through the wire Figure 2 they are moving from left to right and still move randomly as well.
Figure 2 — Operating the switch in the circuit above causes electrons to flow from left to right, in the opposite direction of the current. Electrons have a negative charge. They are attracted to the positive end of the battery. The free electrons move through the copper, flowing from the negative to positive terminal of the battery note that they flow in the opposite direction to conventional current; this is because they have a negative charge.
The copper ions in the wire vibrate. Sometimes an ion blocks the path of a moving electron. The electron collides with the ion and bounces off it. This slows down the electron. Some of its energy has been transferred to the ion, which vibrates faster. In this way, energy is transferred from the moving electrons to the copper ions. The copper gets hotter. This explains why:. Copper is a good conductor of heat. This means that if you heat one end of a piece of copper, the other end will quickly reach the same temperature.
Most metals are pretty good conductors; however, apart from silver, copper is the best. Thermal conductivity of common metals. When you heat one side of a material, the other side will warm up. The values above are a measure of how quickly the other side gets as hot as the heated side. The only other material that has similar resistance to corrosion is stainless steel. However, its thermal conductivity is 30 times worse than that of copper. Applications Copper allows heat to pass through it quickly.
It is therefore used in many applications where quick heat transfer is important. These include:. Conducting heat Copper is made from a lattice of ions with free electron see Figure 1.
The ions are vibrating and the electrons can move through the copper rather like a gas. Figure 3 shows what happens when one end of the piece of copper gets hotter. The copper ions at the hot end vibrate more. Note: the electrons have been left out of the picture to keep it clear. Figure 3 — The left hand end of the piece of copper is hotter. Figure 4 focuses on just a few electrons to see how they conduct heat from the left to the right.
Figure 4 — How electrons conduct heat from the left to the right only a few are shown to make it easier to see. Non-metals conducting heat Compare this with how heat is conducted in a non-metal. The vibrating particles pass on the vibrations to their nearest neighbours. This is much slower. Copper is low in the reactivity series. This is important for its use for pipes, electrical cables, saucepans and radiators. It also means that it is well suited to decorative use.
Jewellery, statues and parts of buildings can be made from copper, brass or bronze and remain attractive for thousands of years. Copper can be combined easily with other metals to make alloys.
The first alloy produced was copper melted with tin to form bronze — a discovery so important that periods in history are called The Bronze Age. Much later came brass copper and zinc , and — in the modern age — cupronickel copper and nickel.
The alloys are harder, stronger and tougher than pure copper. The copper alloy tree shows the options for adding other metals to make different alloys.
Below are some examples. Click on the diagram above to see a larger version. Copper is inherently hygienic, meaning it is hostile to bacteria, viruses and fungi that settle on its surface. This property is seeing the installation of surfaces made from copper and copper alloys in hospitals and other areas where hygiene is a key concern. For more information, see the Copper, Pathogens and Disease resource.
Copper can be joined easily by soldering or brazing. This is useful for pipework and for making sealed copper vessels. Copper is a ductile metal. This means that it can easily be shaped into pipes and drawn into wires.
Copper pipes are lightweight because they can have thin walls. Copper and copper alloys are tough. This means that they were well suited to being used for tools and weapons. Imagine the joy of ancient man when he discovered that his carefully formed arrowheads no longer shattered on impact. The property of toughness is vital for copper and copper alloys in the modern world.
Copper is non-magnetic and non-sparking. Because of this, it is used in special tools and military applications. Copper and its alloys, such as brass, are used for jewellery and ornaments. They have an attractive golden colour which varies with the copper content.
They have a good resistance to tarnishing making them last a long a time. Copper can be recycled without any loss of quality. For more information, see the Copper Recycling and Sustainability resource.
It does so by reducing the activation energy. Catalysts in biological reactions are called enzymes. Copper speeds up the reaction between zinc and dilute sulfuric acid. It is found in some enzymes, one of which is involved in respiration. It really is a vital element!
Copper wire can be wound into a coil. The coil will produce a magnetic field and, being made of copper, won't waste much electrical energy. Copper coils can be found in:. If we could look closely enough, we would see that there are electrons moving about between the copper atoms.
How Particle Accelerators Work
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Electron-beam spectroscopy for nanophotonics
Since the early days of the cathode ray tube in the s, particle accelerators have made important contributions to scientific and technological innovation. Today, there are more than 30, particle accelerators in operation around the world. A particle accelerator is a machine that accelerates elementary particles, such as electrons or protons, to very high energies. On a basic level, particle accelerators produce beams of charged particles that can be used for a variety of research purposes. There are two basic types of particle accelerators: linear accelerators and circular accelerators. Linear accelerators propel particles along a linear, or straight, beam line.
It's hard to imagine our homes without electricity. There would be no TV, computer or video games. You'd have to do your homework by candlelight or oil lamps. You wouldn't be able to listen to your favourite bands on the radio or CD player — instead you'd have to make your own music! Electricity is a form of energy that starts with atoms. You can't see atoms because they're too small, but they make up everything around us. There are three parts to an atom: protons, neutrons and electrons. Electricity is created when electrons move from atom to atom.
What is an electric current?
What is Electricity? Any appliances that we use in our daily lives such as household appliances, office equipments and industrial equipments, almost all of those things take electricity. Therefore, we should understand electricity.
This is why the chemical symbol for copper is Cu. Copper has many extremely useful properties, including:. See below for more information on each of these properties, and how they benefit us in our daily lives. A good electrical conductivity is the same as a small electrical resistance. An electric current will flow through all metals, however they still have some resistance, meaning the current needs to be pushed by a battery in order to keep flowing. The bigger the resistance, the harder we have to push and the smaller the current is. Current flows easily through copper thanks to its small electrical resistance, without much loss of energy. This is why copper wires are used in mains cables in houses and underground although overhead cables tend be aluminium because it is less dense. However, where size rather than weight is important, copper is the best choice. Thick copper strip is used for lightning conductors on tall buildings like church spires.
Last updated: May 13, I f you've ever sat watching a thunderstorm, with mighty lightning bolts darting down from the sky, you'll have some idea of the power of electricity. A bolt of lightning is a sudden, massive surge of electricity between the sky and the ground beneath. The energy in a single lightning bolt is enough to light powerful lamps for a whole day or to make a couple of hundred thousand slices of toast! Electricity is the most versatile energy source that we have; it is also one of the newest: homes and businesses have been using it for not much more than a hundred years.
What is Electricity?
Here is a quote from a science-like show I saw recently. In the scene, two individuals were talking about using batteries for an electric motor. It should be noted that one of these individuals is labeled as "a physicist. It's a matter of how much acid you need to store enough charge so that the two cells - the positive and negative, can create current to drive that motor. And you need that many to have the amp-hours which is another way to say capacity so that you can drive for some distance. It's not that the narrative is terrible but it is terrible.
How Electricity Gets to You
Being fermions , no two electrons can occupy the same quantum state , in accordance with the Pauli exclusion principle. The wave properties of electrons are easier to observe with experiments than those of other particles like neutrons and protons because electrons have a lower mass and hence a longer de Broglie wavelength for a given energy. Electrons play an essential role in numerous physical phenomena, such as electricity , magnetism , chemistry and thermal conductivity , and they also participate in gravitational , electromagnetic and weak interactions. Electromagnetic fields produced from other sources will affect the motion of an electron according to the Lorentz force law.
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Although no charge or fee is required for using TeachEngineering curricular materials in your classroom, the lessons and activities often require material supplies. The expendable cost is the estimated cost of supplies needed for each group of students involved in the activity. Most curricular materials in TeachEngineering are hierarchically organized; i.