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Basic Electricity unit #1 & #2

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Across
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One of the fundamental parts of which an atom is composed. It is the positively charged center of the atom composed of protons and neutrons
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A device designed to open and close a circuit by non-automatic means, and to open the circuit automatically on a predetermined overload of current, without injury to itself when properly applied within its rating.
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The science of the behavior of electrons, especially in vacuum tubes, photoelectric cells, and transistors.
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Produced by the existence of charged bodies, either positive or negative. The body exists with a lack of electrons or an excess of electrons without a continuous flow.
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One of the fundamental particles of which an atom is composed. It carries a negative electric charge of one electronic unit. Electrons surround the positively charged nucleus of the atom.
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The smallest division of a chemical element that exhibits all properties of that element.
Down
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A conductor of electricity.
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The relative amount of electric charge at one point in an electric circuit compared with that at another point in the circuit, which causes a current flow through a continuous path between the two points. Also referred to as electromotive force and potential difference.
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The rate of movement of free electrons through an electrical conductor. It is usually expressed in amperes and is designated by the symbol I.
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A circuit diagram that shows the connections of an installation or its component parts. It may cover internal or external connections that are involved.
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A unit of electrical current, equal to 1/1000 ampere.
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A material that offers very high resistance to flow of electrical current, so that essentially no current flows through it. Used to isolate and separate conductors in a circuit so that electricity only flows through those conductors in the intended manner.