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Ch 1 -- Electricity
Vocabulary for Ch 1 Introduction to Electricity
| Term | Definition |
|---|---|
| parallel circuit | type of circuit in which different loads are on seperate branches...electrons have different paths |
| insulator | a material in which charges (electrons) cannot easily move |
| electric current | the rate in which charges (electrons) move past a given point on a wire....like water flowing in a river |
| Law of Electric Charges | the law that states opposite charges attract and like charges repel |
| loads | devices that uses electrical energy to do work...they change electricity into other forms of energy |
| thermocouple | a device that changes heat energy into electrical energy |
| battery | a device made up of many electrical cells which move electrons because of chemical reactions |
| electric circuit | a complete, closed path for electrons to travel through |
| resistance | the opposition to the flow of electric charges....it slows down electrons |
| switch | a device that opens and closes a circuit |
| electric cell | a device that changes chemical energy into electrical energy |
| electric discharge | the loss of static electricity as charges (electrons) move off of an object |
| photocell | a device that changes light energy into electrical energy |
| conduction | the transfer of electrons from one object to another by direct contact |
| induction | the rearrangement of electrons in one object without the direct contact of a charged object...like bringing a charged balloon near a wall or the hairs on your arm |
| force | a charged object exerts an electric ______ on another charged object |
| electric power | the rate that electric energy is changed into work....current X voltage...measured in watts or kilowatts |
| conductor | a material in which charges (electrons) can move more easily |
| static electricity | the buildup of electric charges on an object |
| voltage | acts like a "hill" because there is a difference in energy between two points....makes the electrons "want to" flow |
| series circuit | a type of circuit in which all of the parts are connected in one loop |
| Ohm's law | Voltage (V) = Current (I) x Resistance (R) |
| breakers and fuses | stop the flow of electrons to keep our houses safe...they stop possible electrical fires when current gets too high |
| electric meter | a tool used to measure the amount of electrical energy used in a house |
| as voltage goes up, current goes ________ | up |
| as resistance goes up, current goes _________ | down |
| AC | Alternating Current (electrons move forwards and backwards in wires plugged into the wall) |
| DC | Direct Current (electrons move in 'one direction' :} in wires plugged into a battery) |
| lightning rods | bring the electricity of lightning safely down to the ground from a rod on the roof through wires on the structure to a pole in the ground |
| electrons | the negatively charged particles on the outer edge of atoms...referred to as "charges" in this chapter |
Created by:
browngdavid
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