This site is designed to give information about the basics of Electricals.
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Some of the site which we found useful for learning electrical
concepts:
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What is Resistance? It is a property of the material by the virtue of which it opposes the flow of electrons through the material. In electrical terms, resistance is offered to the flow of current by electrons of the material. (Also read laws of resistance below) Symbol of Resistance : "R" Unit or Resistance : "Ω" (Ohm) Search Engine Submission - AddMe What is Inductance? ---- Inductance is the property of the material by the virtue of which it opposes any change of magnitude and direction of electric current passing through the conductor. | Symbol of Inductance: "L" | Unit of Inductance: "H" (Henry) What is One Henry? ---- Inductance is said to one Henry when a current through the conductor changes at a rate of 1Amp/sec inducing 1V across the coil. 3 points to remember 1. A simple inductor is formed when a coil of finite length is wound/ twisted into a coil. 2. When current is passed through the coil the electromagnetic field is formed. 3. At the time when there is change in the direction of the electric current the electromagnetic field also changes due to which the voltage is induced across the coil. |
| Laws of Resistance: | ||
| Resistance offered by any conductor depends upon the following factors: | ||
| i. it varies directly with the length (l) |
R α l / A |
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| ii. it varies inversely as the cross-section A of the conductor. | ||
| iii. it depends upon the nature of the material. | ||
| iv. it also depends upon the temperature of the conductor. | ||
