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18 Cards in this Set

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Charge

Current multiplied by the time.

Electric current

A flow of charge.

One coulomb

The total charge supplied by a current of one ampere in a time of one second.

Conductors

A material with a high number density of conduction electrons and therefore a low resistance.

conventional current

A model used to describe the movement of charge in a circuit. Conventional current travels from + to -.

Electron flow

The movement of electrons from - to +.

Resistance

A property of a component that regulates the electric current through it.

Kirchhoff's first law

The sum of the currents entering any junction is always equal to the sum of the current leaving the junction.

Electrolyte

A fluid that contains ions that are free to move and conduct electricity.

Insulators

A material with a small number density of conduction electrons and therefore a very high resistance.

semiconductor

A material wit ha lower number density of conduction electrons than a conductor and therefore a high resistance.

Electromotive force e.m.f.

The electrical energy transferred per unit charge when one form of energy is converted into electrical energy, measured in volts(V) and potential difference.

Ohm's law

The current through a conductor is proportional to the potential difference across it, provided physical conditions, such as temperature, remain constant.

Components

Parts of electric circuits, including bulbs, LDRs, etc.

I-V characteristic

A graph to show how the electric current through a component varies with the potential difference across it.

Potential difference

The electrical energy transferred per unit charge when electrical energy is converted into another form of energy.

Kelvin

SI unit of temperature.

Kirchhoff's second law

In any closed loop in a circuit the sum of the e.m.f.s is equal to the sum of the p.d.s.