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SELMAN, CHAP 6 (2)
Electrodynamics
VOCAB | DEFINITIONS |
---|---|
ELECTRODYNAMICS | the science of electric charges in motion |
The Nature of an Electric Current | an electric current consists of a flow of charged particles, which may occur under th following conditions, 1. in a vacuum, 2. in a glass, 3. in an ionic solution 4. in a metallic conductor |
ELECTRIC CURRENT | in a solid conductor, consists of a flow of electrons only |
ELECTRIC CIRCUIT | defined as the path over which the current flows |
BATTERY | converts chemical energy to electrical energy |
GENERATOR | converts mechanical energy to electrical energy |
POTENTIAL DIFFERENCE | difference in electrical potential energy between two points in an electric circuit |
VOLT | (the unit of potential difference) which will maintain a current of ampere in a circuit whose resistance is one ohm |
ELECTROMOTIVE FORCE (emf) | applies to the maximum difference of potential between the terminals of a battery |
CURRENT | defined as the amount of electric charge flowing per second |
AMPERE | the unit of current |
RESISTANCE | is that property of the circuit which opposes or hinders the flow of an electric current |
OHM | the unit of electrical resistance |
The resistance of a conductor depends on | Material, (conductors, semi-conductors, insulators) Length, Cross-Sectional Area, and Temperature |
Dry Cell Battery | used in flashlights |
Wet Cell Battery | used as an automobile battery |