Electricity

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 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 is a wire ampacity table?

    Q: What is a wire ampacity table?

    A: A wire ampacity table is a chart displaying the electrical amp rating carried by specific wire types and gauge sizes. Amperage is a measure of the electrical current flowing through a circuit, which is measured in amps. Proper wire size must meet specific amp limits.
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  • How fast does light travel?

    Q: How fast does light travel?

    A: In a vacuum, the speed of light is 186,282 miles per second. This is equal to 299,792 kilometers per second or about 670,616,629 miles per hour.
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  • What is the definition of hydroelectric power?

    Q: What is the definition of hydroelectric power?

    A: Hydroelectric power is the converting of energy coming from running water to produce electricity. Hydroelectricity is a similar term that refers to the electricity that is produced from this process.
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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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  • What is electromagnetic radiation?

    Q: What is electromagnetic radiation?

    A: According to the Encyclopedia Britannica, in terms of classical theory, electromagnetic radiation refers to energy that flows at the universal speed of light via free space or a material medium in the form of electric and magnetic fields that comprise electromagnetic waves, such as radio waves, gamma rays and visible light. Electromagnetic waves are characterized by their intensity and the frequency of the electric and magnetic field's time variation.
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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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  • What is electric field intensity?

    Q: What is electric field intensity?

    A: Calculating electric field intensity requires the knowledge about the current charge level of the object that is making the electric field and the distance between that charged object and the measuring tool. Electric field intensity (or strength) is a vector quantity, which means it has direction as well as magnitude. The magnitude of this intensity comes from the way it is measured.
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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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  • 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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  • How does an electric spark occur?

    Q: How does an electric spark occur?

    A: Electrostatic discharge, or ESD, is a sudden flow of electric current between two objects that have different electronic potentials. An electric spark is a type of ESD wherein there is a flow of electric current across an air gap, increasing the air temperature, which produces light and sound emission.
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  • Who invented neon lights?

    Q: Who invented neon lights?

    A: At the beginning of the 20th century, French engineer, chemist and inventor Georges Claude invented the neon lamp. He sent electricity into a tube of neon gas, which had been discovered by William Ramsey and M. Travers in 1898.
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  • What causes electric fields?

    Q: What causes electric fields?

    A: Electrical fields are caused by the attraction and repulsion of electrical charges. Electrical fields are measured using volts per meter and are central to the functioning of electrically-powered devices, such as televisions, light bulbs and computers.
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  • How does a potato produce electricity?

    Q: How does a potato produce electricity?

    A: According to the BBC, potatoes produce electricity by virtue of their acidic juice, which reacts with two electrodes placed in the potato. The chemical reaction produces a weak current between the two electrodes.
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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 is the best conductor of electricity?

    Q: What is the best conductor of electricity?

    A: Silver is the best metal conductor, but graphene is the best overall material at conducting electricity. Graphene consists of carbon atoms arranged in extremely thin sheets, and has the lowest electrical resistance of any commonly known material.
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  • How does a windmill produce electricity?

    Q: How does a windmill produce electricity?

    A: Windmills produce electricity by electromagnetic induction, the process in which the movement of magnets in a magnetic field generates electricity. In a windmill, when wind moves the blades of the windmill that move the rotor, the rotor rotates a shaft that holds magnets in the magnetic field of the generator, generating alternating current that is sent along power lines.
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  • What happens to the current in a short circuit?

    Q: What happens to the current in a short circuit?

    A: When a short circuit occurs, electrical current experiences little to no resistance because its path has been diverted from its normal direction of flow. This in turn produces excess heat and can damage or destroy an electrical appliance. It can also create a fire hazard and an electrical shock hazard if left unattended
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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 color is lightning?

    Q: What color is lightning?

    A: Lightning is usually white, but it can be a variety of colors depending on what the light travels through to get to the viewer’s eyes. In snowstorms, lightning can appear pink or green. Particles in the atmosphere affect the color by absorbing or diffracting a portion of the white light.
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  • What is the function of a lightning rod?

    Q: What is the function of a lightning rod?

    A: A lightning rod conducts a positive charge up to meet the negative charge of a lightning strike, allowing the strike to hit the rod and travel through attached wires to an underground connection. This diverts the strike away from a building, preventing or lessening potential damage, according to About.com.
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