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Electric Circuit:
A closed path along which electrons that are powered by an energy source can flow
i.e. any closed circuit

Voltaic Cell:
A source of energy that generates an electric current by chemical reactions involving two different metals or metal compounds separated by a conducting solution

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

Dry Cell:
A cell that contains an electrolyte made of a paste

Wet Cell:
A cell that contains a liquid electrolyte

Primary Cell:
A cell that can only be used once
i.e. a standard "battery"

Secondary Cell:
A cell that can be recharged

Fuel Cell:
A cell that generates electricity through the chemical reactions of fuel that is stored outside the cell

Solar Cell:
A cell that converts sunlight into electrical energy
i.e. a solar panel

Terminal:
A position on a cell that must be connected tot other components to form a circuit

Switch:
A control device that can complete a circuit or break the circuit to which it is connected

Open Circuit:
A circuit that contains a gap or break

Electric Current:
A measure of the number of charged particles that pass by a point in an electric circuit each second

Coulomb:
The quantity of charge equal to that of 6.25x10^18 electrons

Ampere:
The unit used to measure current. 1 ampere is equal to a flow of 1C/s

Electrical Resistance:
The property of a substance that hinders electric current and converts electrical energy into other forms of energy

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 hear, motion, sound or light

Potential Difference:
the difference between the electrical potential energy per unit of charge at two points in a circuit

Volt:
The unit for potential difference, which is equal to 1J/C

Circuit Diagram:
A diagram that uses standard symbols to represent the components in an electric circuit and their connections

Series Circuit:
A circuit where there is only one path for the electrons to flow

Parallel Circuit:
A circuit where there are multiple paths for the electrons to flow

Ohm's Law:
The ratio of potential difference to current is a constant called resistance

Ohm:
The unit for resistance, equivalent to one volt per ampere

Superconductor:
A device used in an electric circuit to decrease the current through a component by a specific amount

Nonohmic:
Not following Ohm's law

Loads in Series:
 There are certain mathematical equations to describe potential difference, current, and resistance in a series circuit:
 Current: I_{T}=I_{1}=I_{2}=I_{3 }etc.
 Potential Difference: V_{T}=V_{1}+V_{2}+V_{3 }etc
 Resistance: R_{T}=R_{1}+R_{2}+R_{3 }etc.

Potential Difference:
 There are certain mathematical equations to describe potential difference, current, and resistance in a parallel circuit:
 Current: IT=I1+I2+I3 etc.
 Potential Difference: VT=V1+V2+V3 etc.
 Resistance: RT<R1; RT<R2; RT<R3

