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Physics definitions

all the definitions from grade 9 physics

TermDefinition
volcanic cell a source of energy that generates an electric current by chemical reactions involving two different metals or metal compounds separated by a conducting solutiuon
battery a connection of two or more cells
electrode one of two metal terminals in a cell or battery
electrolyte a solution or paste that conducts charge
friction a process in which objects made from different materials rub against each other, producing a net static charge on each
direct current current in which charged particles travel through a circuit in only one direction
insulator a material in which electrons cannot move easily from one atom to another
secondary cell a cell that can be recharged
primary cell a cell that can be used only once
wet cell a cell that contains a liquid electrolyte
dry cell a cell that contains an electrolyte made of paste
conductor a material in which electrons can move easily between atoms
contact generating a net charge on a neutral object by touching it with a charged object
solar cell a cell that converts sunlight into electrical energy
terminal a position on a cell that must be connected to other components to form a circuit
switch a control device that can complete or break the circuit to which it is connected.
open circuit a circuit that contains a gap or break
closed circuit a circuit that is complete with no breaks or gaps
semiconductor a material in which electrons can move fairly well between atoms
coulomb the quantity of charge that is equal to the charge of 6.25 x 10(18) electrons
ampere the unit of electric current, equivalent to one coulomb per second
resistor a device used in an electric circuit to decrease the current through a component by a specific amount.
load a resistor or any other device that transforms electrical energy into heat, motion, light or sound.
ground an object that can supply a very large number of electrons to, or can remove a very large number of electrons from, a charged object, thus neutralizing the object
electroscope a device for detecting the presence of an electric charge
alternating current a current in which electrons move back and forth in a circuit
potential difference the difference between the electric potential energy per unit of charge at two points in a circuit.
volt the unit for potential difference; equivalent to one joule (J) per second
series circuit a circuit in which there is only one path along which electrons can flow
parallel circuit a circuit in which there is more than one path along which electrons can flow
Ohm's law the ratio of potential difference to current is a constant called resistance.
lightning rod a metal sphere or point that is attached to the highest part of a building and connected to the ground
static electricity an electric charge that tends to stay on the surface of an object, rather than flowing away quickly
Created by: caitlynkummer
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