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Physical Science
Chpt 10 vocab for final
Term | Definition |
---|---|
Static Electricity | stationary electrical charges and the forces that they exert |
Conventional Current | the flow of positive charges through a conductor which is opposite to the flow of electrons |
Direct Current | flows in one direction towards a current |
Electrical Circuit | a complete path from a source of electrons through a conductor and back to an electron sink |
Electrical Potential Energy | the energy or work that can be done by charges moving between two points of different voltages |
Electroscope | an instrument that can detect electrical charges |
Lightning Rod | made of conductors and are attached to the highest point of a building |
Leyden Jar | a glass jug coated with thin layers of lead that stored electrical charges |
Capacitor | two layers of metal foil separated by an insulating material and sealed with an insulator that stores charge |
Cathode Ray Tube (CRT) | a large vacuum tube screen that is used to display images that are said to be painted by electrons |
Conductor | a material that conducts electricity |
Insulator | a material that stops the flow of electricity |
Semiconductor | allow limited electron flow or conduct only under certain circumstances |
Switch | allows you to open and close a circuit by opening and closing the gap in the current path |
Electrical Discharge | the loss of static charge as electrons move to another object |
Overcurrent Protection | prevents currents in a faulty circuit from starting a fire |
Law of Charges | opposite charges attract and like charges repel |
Lines of Force | they align with the direction that the electrostatic force vector would move a test charge |
Electrochemical Cells | supply electrons raised by chemical charges |
Electrostatic Force | force stronger than the force of gravity that is between electrical charges |
Electrical Induction | the creation of a charged region on a neutral object when exposed to a nearby electrical charge |
Electrical Dipole | neutral molecules whose electrons have shifted to form positive and negative poles |
Electrical Resistance | the property of all electrical circuit elements that impedes the flow of current to some extent |
Series Circuit | only one path for the current to travel through |
Parallel Circuit | there is more than one path for the current to travel through |
Circuit Breaker | a switch that is manually closed , but automatically trips open if the current flowing through it exceeds the designated value |
Short Circuit | a location in an electrical current where the current bypasses a circuit's load to take a low-resistance path back to the current's source |
Fuse | a onetime use overcurrent protection device that breaks a circuit when its conductor strip melts due to current becoming too high |
Arc-Fault Circuit Interrupters | a reusable overcurrent protection device that opens a switch when the pulsing, high current conditions associated with arcing are detected |
Ground-Fault Circuit Interrupters | an electrical device that opens a circuit when it senses an abnormal path for the current to ground exists |
Resistor | an electrical circuit component whose specific purpose is to impede current flow or create a potential difference between two points in the circuit |
Battery | consists of one or more electrochemical cells |
Circuit | a complete and closed path around which a circulating electric current can flow |
Generator | converts mechanical energy from an external source into electrical energy |
Electrical Current | a continuous flow of electrical charges |
Coulomb | the SI unit for electrical charges |
Ampere | used to measure electrical current |
Volt | used to measure potential difference |
Ohms | the SI unit for electrical resistance |
Ohm's Law | when the voltage is doubled, the current is doubled; when the resistance is doubled, the current is cut in half |