Electricity

Haitham N. Alahmad

Electricity

-It is an electrical energy, which is transported from one location to another by electrons

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Types of ElectricityThere are 2 types:

1-static electricity:

Where the charge is not moving, it deal with production of charges by friction.

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Static Electricity-Static electricity generated by friction(rubbing) of dissimilar

materials. Static electricity is called "high voltage " High voltage can attract lint or tiny bits of paper, and it can make hair stand up.

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Frictional Electricity

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Types of Electricity2- Current electricity:

Where the charge is moving in a conductor, due to difference of potential across its two ends.

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Charge

-When two bodies are rubbed togother,there is transference of electrons from one body to another.

-The body that loses the electrons will be positive charged and the other that gains electrons is negative charged.

-Therefore there are 2 types of charges: positive charge and negative charge.

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Properties of Charges

-1) Like charge repel each other.

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Properties of Charges

2-Unlike charges attract each other.

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Properties of Charges

3-There is force(F)of attraction or repulsion between the two charges.

4-The charge cannot be created nor can be destroy.

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SI units

-The SI unit of electric charge is coulomb(C).

-The SI unit of electric unit is ampere(A).

-Ampere: it is a measure of electrical current.

-Electrical current is the rate of flow of electrical charge.

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SI units

-Electrical current

-Therefore the SI unit of charge is ampere second (also coulomb).

1coulomb=1ampere second

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time

arg current

ech

second)(pere)current(am charge time

Radiographic exposure factor

-Radiographic exposure factor known as `mAs`

(mill ampere second).It is actually a unit of electrical charge.

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coulomb`s law of electrostatic.

-The force of repulsion or the force of attraction (F) is directly proportional to product of the charges and inversely proportional to square of distance between them.

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coulomb`s law of electrostatic.-Let A and B the two charged bodies and +q1 and +q2 the

charged on them. These are separated by a distance d cm.Then the force of repulsion F between the charged would be,

F α q1×q2F α q1×q2

F α 1/ dF α 1/ d22

d=distanced=distance

K=direct constantK=direct constant

F=k(q1*q2)/d2F=k(q1*q2)/d2

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time

arg current lectric

eche

A B

Electrical field

-It is a region in the space in which a charged body can experience a force of attraction or repulsion.

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Thank you for your attention

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