Archive for the ‘Basic Concept Of Electricity’ Category
Thursday, November 20th, 2008 26 views
In electronics and engineering we often heard something called conductor... what is a conductor..? A conductor is a material which contains movable electric charges. In metallic conductors, such as copper or aluminium, the movable charged particles are electrons (See electrical conduction). Positive charges may also be mobile in the form ...
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Thursday, November 6th, 2008 85 views
In this reading we are going to talk about capacitance. I have to make a distinction here between capacitor and capacitance. A capacitor is a device, whereas capacitance is an electrical property. First we will discuss the capacitor and then the property of capacitance.
We will avoid mathematics where possible.
Construction
As you ...
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Tuesday, April 8th, 2008 94 views
While you are working on electric circuits, there is often the possibility of receiving an electric shock by touching the "live" conductors when the power is on. The shock is a sudden involuntary contraction of the muscles, with a feeling of pain, caused by current through the body. If severe ...
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Tuesday, April 8th, 2008 561 views
This article explain the complete basic theory of magneticm.
MAGNETISM AND ELECTRICITY
Any wire carrying a current of electrons is surrounded by an unseen area of force called a magnetic field. For this reason, any study of electricity or electronics must consider magnetism.
Almost everyone has had experiences with magnets or with pocket ...
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Monday, April 7th, 2008 151 views
When current flows in a resistance, heat is produced because friction between the moving free electrons and the atoms obstructs the path of electron flow. The heat is evidence that power is used in producing current. This is how a fuse opens, as heat resulting from excessive current melts the ...
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Monday, April 7th, 2008 374 views
In many circuits, some components are connected in series to have the same current, while others are in parallel for the same voltage. When analysing and doing calculations with series-parallel circuits you simply apply what you have learnt from the last two readings.
In the circuit of figure 1 below, we ...
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Sunday, April 6th, 2008 451 views
A common method of producing an emf is by the chemical action in a battery. Without going into the chemical reactions that take place inside a cell, a brief outline of the operation of a Leclanche cell is given here.
Consider a torch cell. Such a cell (two or more cells ...
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Sunday, April 6th, 2008 120 views
What makes such a simple thing as an electric lamp glow? It is easy to pass the problem off with the statement, "The switch connects the light to the power lines and it glows" or something to that effect. But what does connecting the light to the power lines do? ...
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Sunday, April 6th, 2008 49 views
Work = Power x Time
Practical Units of Power and Work. Starting with the watt, we can develop several other important units. The fundamental principle to remember is that power is the time rate of doing work, while work is power used during a period of time. The formulas are:
Power = ...
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Sunday, April 6th, 2008 50 views
The unit of electrical power is the watt (W), named after James Watt (1736-1819). One watt of power equals the work done in one second by one volt of potential difference in moving one coulomb of charge.
Remember that one coulomb per second is an ampere. Therefore, power in watts equals ...
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