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Electric Circuit:
 Is a closed path along electrons that can flow and are powered by an energy source.


Voltaic Cell:
Is a source of energy that generates an electric current by chemical reactions involving two different metals separated by a solution that is a conductor.

Battery:
 Is a connection of 2 or more cells.

Electrode:
One or two terminals in a cell or battery.

Electrolyte:
A solution or paste that conducts a charge.

Dry Cell:
A cell that contains an electrolyte that's a paste.

Wet Cell:
A cell that contains a liquid electrolyte.

Primary Cell:
A cell that can be used only once.

Secondary Cell:
A cell that can be recharged and reused.

Fuel Cell:
Is a cell that generates electricity through chemical reactions of fuel that's stored outside the cell.

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 controlled device that can complete or break the circuit that it's connected to.

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(C):
Is the quantity of charge that's equal to the charge of 6.25 times 10 to the power of 18 electrons.

Ampere(A):
The unit of electric current, equivalent to 1 coulomb per second.

Electrical Resistance:
The property of a substance that hinders electric current and converts electrical renergy to 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 heat, light, motion, or sound.

Potential difference (voltage):
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 coulomb(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's only one path which electrons can flow.

Parallel Circuit:
A circuit where there's more than one path along which electrons can 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 amp (A).

Superconductor:
A material through which electric charge can flow without resistance.

Nonohmic:
Doesn't follow Ohm's law.

Load in Series:
The potential difference(V) between the terminals of a cell is the energy required(Joules(J)) to move one coulomb(C) of charge around the circuit.

Load in Parallel:
There's more than one path electrons can flow in.

