English for students of Physics_Unit 14

Chia sẻ: Xu Ka | Ngày: | Loại File: PDF | Số trang:18

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English for students of Physics_Unit 14

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Electric charge and a measure for the quantity of charge Any household electrical appliance – be it a light bulb, a motor, or a television set – has two contacts which have to be plugged in to get the device to operate. This common characteristic, that an electrical apparatus must have two wires connecting it to a source of electricity, gave the rise in the eighteenth century to the idea that when an electrical device is working, something is moving through it. That something is called electric charge. When you pull out a plug, turn off a switch, or disconnect...

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