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25 Cards in this Set
- Front
- Back
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All matter is composed of
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molecules
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Molecules are made up of a combination of
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atoms
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Atoms have a nucleus with ________ orbiting around it
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electrons
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The nucleus is composed of ________ and ________
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protons
neutrons |
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Electrons have a
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negative charge
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Protons have a
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positive charge
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The number of __________ a material has determines its __________
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free electrons
electrical characteristics |
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An electric current is produced when a free electrons move from
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one atom to the next
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Materials that permit many electrons to move freely are colled
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conductors
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Voltage describe the _________ in the electrical system
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pressure
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The letter _____ represents the voltage in a circuit
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E
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The current in an electrical cicuit is the
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flow of electrons
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Current is measured in
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amperes or amps
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The letter _____ is used to represent current in an electrical circuit
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I
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Atoms a made of particles called
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protons, neutrons and electrons
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The _______ and ________ are contained in the _________ or center of the atom.
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protons
neutrons nucleus |
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Canadian Electrical Code restricts us to loading the circuit to
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80%
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Current is trying to flow to
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ground
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When a coulomb of electrons passes a given point in one second, then that is called
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one amp of current
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Resistance is the oposition to the ___________
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flow of current in the circuit
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Resistance is measured in
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ohms
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The letter ____ is used to represent resistance in an electrical circuit
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R
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Power is the term used to describe the _________ by the electrical circuit
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work done
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one horsepower is ________ watts
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750
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There are three major dangers present with electricity
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Shock, arc and blast
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