Electricity

A:

While there are many different methods of generating electricity, most electricity that powers homes and businesses comes from electric turbines. These devices spin a magnetic core through copper wiring, creating a charge through magnetic induction. In many cases, the energy to turn the turbine comes from steam generated by coal, natural gas or nuclear fission. In more sustainable cases, moving water or wind turns the turbine and generates electricity.

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  • What is the electromagnetic theory?

    Q: What is the electromagnetic theory?

    A: The electromagnetic theory is a united theory of electromagnetism established by James Clerk Maxwell. This theory primarily discusses the relationships between electric field and magnetic field based from previous observations and experiments related to electricity, magnetism and optics combined.
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  • How does static electricity work?

    Q: How does static electricity work?

    A: According to the Library of Congress, static electricity occurs when the surface charge of an object changes. If someone rubs certain types of materials together, electrons can jump from one to the other, changing the effective charge of both items. Positively charged items attract negatively charged items, while items with the same charge repel. Bringing two objects together with significantly different charges can result in a vivid spark.
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  • How does a switch work on a circuit?

    Q: How does a switch work on a circuit?

    A: A switch works by interrupting current flow around an electrical circuit. A basic switch is a binary device: it is either open (off) or closed (on). The simplest type of switch is one that comprises two metal strips that are brought into contact by a spring or some other form of actuating mechanism.
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  • Why do longer wires have more resistance?

    Q: Why do longer wires have more resistance?

    A: Resistance occurs when the electrons carrying an electrical charge collide with the atoms of a wire and are impeded. A longer wire provides more opportunities for collisions, which in turn creates greater resistance.
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  • What is the origin of solar energy?

    Q: What is the origin of solar energy?

    A: Solar energy comes from the sun, but the energy the sun emits comes from nuclear fusion on a massive scale. Specifically, it is the fusion of two hydrogen atoms into a single atom of helium.
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  • How does a dynamo generator work?

    Q: How does a dynamo generator work?

    A: A dynamo generates electricity by using a magnetic field to imbue wires with an electric current. According to the Edison Tech Center, this process generates a direct current that can then be fed down the wires to an alternator for conversion to an alternating current; these alternators are sometimes known as generators.
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  • How many lumens does a 100-watt incandescent light bulb give off?

    Q: How many lumens does a 100-watt incandescent light bulb give off?

    A: According to Energy Star, a standard 100-watt incandescent light bulb emits 1,600 lumens of visible light. The luminous efficacy of an incandescent light bulb is set at 16 lumens per 1 watt.
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  • What are some real life examples of series circuits?

    Q: What are some real life examples of series circuits?

    A: The most common series circuit in everyday life is the light switch. A series circuit is a loop that is completed with a switch connection sending electricity through the loop.
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  • What are the advantages and disadvantages of solar energy?

    Q: What are the advantages and disadvantages of solar energy?

    A: There are a number of advantages, such as its renewable nature, and disadvantages, such as the high initial cost, that are worth consideration when it comes to solar power. The overall benefits of using solar energy over other sources of energy, such as the oil, are high, including the fact that it is friendly to the environment.
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  • How does a light bulb circuit work?

    Q: How does a light bulb circuit work?

    A: A light bulb circuit works when the electric current flowing through the light bulb combines with the current flowing in the battery or power source. The filament and wires in the light bulb conduct electricity so that electric current can move through an electric circuit.
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  • How was electricity discovered?

    Q: How was electricity discovered?

    A: Although knowledge about the existence of electricity existed as early as 600 B.C., it was not until 1600 that William Gilbert published "De magnete, Magneticisique Corporibus," or "On the Magnet" and coined the term "electrica." Before Gilbert, knowledge was limited to that of the magnetic charges of a loadstone and that rubbing an amber or a jet rod with wool caused particles to stick to the rod.
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  • What is a voltmeter used for?

    Q: What is a voltmeter used for?

    A: A voltmeter is an instrument used to measure the voltage between two points in an electrical circuit. Some voltmeters register direct current while others measure alternating current.
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  • What are Isaac Newton's scientific achievements?

    Q: What are Isaac Newton's scientific achievements?

    A: Isaac Newton’s scientific achievements include his three laws of motion — inertia, acceleration, and action and reaction the law of universal gravitation, the reflecting telescope and the theory of calculus. Newton published important written works, the most famous of which is “Principia Mathematica,” where he described elliptical orbits, forces in motion, fluids and mechanics.
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  • How far can lightning travel in water?

    Q: How far can lightning travel in water?

    A: Generally, lightning can travel for 20 feet through water before dissipating. How far the charge travels depends on the intensity of the lightning, topography of the water, salinity and temperature. Lightning does not penetrate deep into water, but the charge disperses in all directions, favoring the surface.
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  • What does electricity do?

    Q: What does electricity do?

    A: Electricity, the flow of electric charge, powers much of the technology used in modern society. The Energy Information Administration explains that electricity is a secondary source of energy, meaning that it comes from the conversion of other energy sources.
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  • What are some good things about nuclear energy?

    Q: What are some good things about nuclear energy?

    A: According to the International Atomic Energy Agency, nuclear energy offers the capability to generate extremely large amounts of electricity without producing greenhouse gases or other air pollutants. Like fossil fuel technologies, nuclear power plants can scale their output to meet demand, and they are extremely fuel-efficient. A single kilogram of uranium can produce up to 3.5 million kilowatt-hours of electricity, where a kilogram of coal produces around 3 kilowatt-hours.
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  • How can I make static electricity?

    Q: How can I make static electricity?

    A: There are many ways to make static electricity. To create a small amount of static electricity a person can develop a static charge by rubbing a glass rod with a silk cloth or amber against wool. The static charge will allow the glass and the amber to attract small amounts of paper and plastic.
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  • How does softball relate to physics?

    Q: How does softball relate to physics?

    A: According to the University of Sydney, softball is related to physics through hitting and pitching. The University notes that many players are aware of certain physics-related phenomena in softball but do not know much about the physics-related concepts they are using in almost every game.
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  • How is electrostatic force explained?

    Q: How is electrostatic force explained?

    A: Electrostatic force, which is also called the Coulomb force or Coulomb interaction, is defined as the attraction or repulsion of different particles and materials based on their electrical charges. Electrostatic force is one of the most basic forms of forces used in the physical sciences, and was discovered by a French physicist named Charles-Augustin de Coulomb in the 1700s. Coulomb discovered electrostatic force after undertaking an experiment, and used the concept of electrostatic force to describe the interaction of particles and molecules in a given space.
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  • How does electricity travel through wires?

    Q: How does electricity travel through wires?

    A: According to the Union University Department of Physics, when an electric current passes through a solid copper wire, the electrons move forward, but the protons within the positive atoms of copper do not. Electricity travelling through a wire moves at an extremely fast speed and is capable of powering anything from a light bulb to a laptop.
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  • How does a laser diode work?

    Q: How does a laser diode work?

    A: A laser diode works by having a p-n junction that is powered by the injection of electric current. The active medium for these lasers is a semiconductor similar to what is found in light-emitting diodes.
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