Electricity

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 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 do electric trains work?

    Q: How do electric trains work?

    A: Electric trains use electricity to power electric motors, driving their wheels and providing locomotion. The electricity comes from one of three sources. It is either delivered via an electrified third rail beneath the train, via electrified cables above the train, or stored in batteries on board the train.
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  • How do wind turbines work?

    Q: How do wind turbines work?

    A: Wind turbines turn the kinetic energy of the wind into mechanical energy and then electricity through the use of a shaft and a gearbox that power an internal generator. Sensors in the wind turbine allow it to turn and adjust its angle for optimum wind capture. Electricity from the turbine generator goes to a substation, where it is converted to a high voltage capable of transportation through power lines.
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  • What will moving electric charges interact with?

    Q: What will moving electric charges interact with?

    A: Moving electric charges will interact with both electric and magnetic fields. Electric fields exert forces on charges regardless of whether or not they're moving. However, magnetic fields only interact with moving charges.
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  • What is the definition of electricity?

    Q: What is the definition of electricity?

    A: Electricity is defined as a type of energy that involves the flow of electrons, according to the Merriam-Webster dictionary. Electricity occurs when an atom gains or loses an electron.
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  • What is the study of matter and energy?

    Q: What is the study of matter and energy?

    A: According to About.com, physics is the study of matter, energy and the way they interact. Physics is a natural science that also encompasses concepts like force and motion. The primary goal of physics is to understand how the universe behaves.
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  • How are current and voltage related?

    Q: How are current and voltage related?

    A: Voltage, or electrical pressure, in a system produces a proportionate amount of current when placed across electrical resistance. Ohm's law indicates that 1 volt passed through 1 ohm of resistance produces 1 ampere of current, or electrical flow. Voltage and current, therefore, have a direct relationship most of the time.
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  • How are conductors and insulators alike?

    Q: How are conductors and insulators alike?

    A: Conductors are materials that allow the flow of electric current, whereas insulators do not. While conductors and insulators are different in that respect, their similarity is in their makeup of atoms. It is these atoms that either have room to float around to facilitate conduction or have little freedom to move around; this lack of freedom makes the material they form an insulator.
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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 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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  • Where does electricity come from?

    Q: Where does electricity come from?

    A: According to National Geographic, electricity comes from energy sources such as fossil fuels, wind energy and hydroelectric power. Electricity is transported from a power station via power lines that carry electrical current into communities.
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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 is it possible to power a light bulb with a potato?

    Q: How is it possible to power a light bulb with a potato?

    A: A potato helps power a light bulb by acting as both a bridge and a separator for two electrodes made of different metals. The two metals most frequently used are zinc and copper because of their ubiquity and difference in electron affinity. The acid in the potato starts the reaction, and the electrolytes in the potato allow a flow of electrons, an electric current, to flow between the electrodes.
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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 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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  • Where does hydropower come from?

    Q: Where does hydropower come from?

    A: Hydropower, also known as hydro-electric power, is generated by hydro-electric dams placed on many of the world's major rivers. These structures divert the flow of the river and harness the force of the water to turn massive turbines that power electricity generators.
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  • How far does light travel in one year at 3 x 108 m/s?

    Q: How far does light travel in one year at 3 x 108 m/s?

    A: According to Universe Today, light travels approximately 9.5 trillion kilometers or 5.9 trillion miles in a year. Light years are commonly referenced units, but astronomers tend to use a unit known as the parsec, equivalent roughly to 3.26 light years.
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  • What does non-renewable energy mean ?

    Q: What does non-renewable energy mean ?

    A: Non-renewable energy means the energy source will eventually run out. Most of the non-renewable energy sources belong to the fossil fuel category. Coal, natural gas, crude oil and liquid petroleum gas are examples of non-renewable energy sources.
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  • What happens to the air when the electrical energy of lightning is discharged?

    Q: What happens to the air when the electrical energy of lightning is discharged?

    A: Surrounding air superheats to more than 18,000 degrees Fahrenheit, expands outward rapidly and produces the strong soundwaves known as thunder when the electrical energy of lightning is discharged in Earth's atmosphere. Most of the energy of lightning is in the form of heat that quickly dissipates in cooler air. Before lightning strikes, the insulating capacity of air breaks down, and the negatively charged atmosphere produces powerful bolts.
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  • What kinds of devices use capacitors?

    Q: What kinds of devices use capacitors?

    A: Virtually every electronic device in widespread use contains some form of capacitor. Used to store electricity, capacitors often help computers avoid losing their memory when the batteries are being recharged. Other devices, such as amplifiers for car stereos, contain capacitors that store energy until it is needed by the amplifier. Motion detectors use capacitors to help achieve the proper timing of the unit’s circuits.
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  • Does lightning come from the ground?

    Q: Does lightning come from the ground?

    A: Lightning originates in the sky, but the part of the cloud-to-ground lightning visible to the human eye comes from the positive electrical charge that responds to the invisible negative electrical charge sent from the clouds. Lightning helps the ground and the atmosphere exchange and balance positive and negative energy.
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