grade 9 unit 2 revision

It is the flow of electric negative charges (electrons) through a conductor.

• Electric resistance

• Electric current

• Electric charge

It is the quantity of charge transferred by a constant current of intensity one ampere in time of one second..

• The electromotive force

• The volt

• The coulomb

It is the resistance between two points of a conductor that has an electric current passing through it of intensity one ampere when the potential difference between these points is one volt.

• The volt

• The ohm

• The electromotive force

It is the potential difference between the two poles of the electric source when the circuit is open.

• The electromotive force

• Electric potential of a conductor

• The ohm

It is the resistance which can be varied in order to control the current intensity and the potential difference in the different parts of the circuit.

• The electric resistance

• Alternating electric current

• The variable resistance

The electric current intensity passing through a conductor is directly proportional to the potential difference across it at a constant temperature.

• Ohm's law

• coulomb's law

• faraday law

It is the radiation or nuclear energy that is either released during nuclear reactions or nuclear bombs.

• Radioactivity

• Radiation pollution

• Radioactive elements

what is meant by that :

The electric current intensity passing through a conductor is 1.5 ampere:

• This means that the quantity of electric current that passes through the conductor in one second equals 1.5 coulomb.

• This means that the quantity of electric charge that passes through the conductor in one second equals 1.5 coulomb.

• This means that the quantity of electric charge that passes through the conductor in one min equals 1.5 coulomb.

what is meant by that :

A work of 10 joule is done to transfer a charge of 5 coulomb between two points

• This means that the ratio between the potential difference across the two points = 20 volt

• This means that the ratio between the potential difference across the two points = 2 volt

• This means that the ratio between the electric current across the two points = 2 volt

The electric current intensity that flows through a wire, if a charge of 6 coulomb passes through it in 3 second.

• 2 A

• 3 A

• 18 A