Article and electricity
Divided material for the passage of electric current in which to:
1 - conductive material: -A material that allows for the passage of electrical current which is also where the material that contains free electrons, This article may differ with each degree of the quality of delivery of electricity, where we find that silver is the finest example of the electric conductive material and then the rest of the material according to the quality of the connection.
2 - insulating material: -A material that resists the passage of electric current, namely, also differ in degree of isolationWhere we find that the solid mica, wood, glass and plastic insulation from the finest materials and then comes the rest of the material according to the quality of insulation.
3 - semiconductor material: (semi-conductor) (Semi - conductor): -A material that allows the passage of electrical current which in one direction only, such as Uniting (rectifiers)
Resistance and power
Can say that the resistance is a feature article of resistance to the passage of electric current, and the unity of this resistance is the Ohm! Resistance (m) and one ohm made by the Chamber that on both sides by voltage (c) one volt so that the current (c) passing in this article amount and one amp {.
Resistivity: -Can say that the resistivity of the material is}: resistance conductor length and one centimeter in cross-section area of one square centimeter in the direction of flow of current; and its symbol (p) is directly proportional to the length (l)And inversely with the sectional area of Mosul (o) {.If (m) a symbol of resistance, (l) the code length of Mosul; (o) cross-section area code
The law of the resistance as follows: -
M = p × s / o Om
Divided material for the passage of electric current in which to:
1 - conductive material: -A material that allows for the passage of electrical current which is also where the material that contains free electrons, This article may differ with each degree of the quality of delivery of electricity, where we find that silver is the finest example of the electric conductive material and then the rest of the material according to the quality of the connection.
2 - insulating material: -A material that resists the passage of electric current, namely, also differ in degree of isolationWhere we find that the solid mica, wood, glass and plastic insulation from the finest materials and then comes the rest of the material according to the quality of insulation.
3 - semiconductor material: (semi-conductor) (Semi - conductor): -A material that allows the passage of electrical current which in one direction only, such as Uniting (rectifiers)
Resistance and power
Can say that the resistance is a feature article of resistance to the passage of electric current, and the unity of this resistance is the Ohm! Resistance (m) and one ohm made by the Chamber that on both sides by voltage (c) one volt so that the current (c) passing in this article amount and one amp {.
Resistivity: -Can say that the resistivity of the material is}: resistance conductor length and one centimeter in cross-section area of one square centimeter in the direction of flow of current; and its symbol (p) is directly proportional to the length (l)And inversely with the sectional area of Mosul (o) {.If (m) a symbol of resistance, (l) the code length of Mosul; (o) cross-section area code
The law of the resistance as follows: -
M = p × s / o Om
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