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Ch 1 -- Electricity

Vocabulary for Ch 1 Introduction to Electricity

TermDefinition
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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