Saturday, August 25, 2012



                       In this post, you will see how current goes through a battery. This post is about basics of Electrical Engineering which is very easy to understand. I add these basic lessons to give a better understanding for you. 

figure 1.1
                                      First I will explain what direct current is. When there is a flow of electrons in a conductor to a specific direction (without altering the direction with respect to time) we call that there is a current flow to the opposite direction of the electron flow. 

                                                             According to figure 1.1 electrons go through the bulb as there is a potential different between the two end of the battery. Electrons flows from negative end to the positive end of the battery. The process is described as follows. 

electrons with high energy comes out from the negative end of the battery. those electrons flow in the conductor through the bulb (bulb represent the load here) to the positive end of the battery.  When the electron goes through the bulb, it absorbs the energy from the electron (potential energy contained in electron) . Then the bulb convert that energy into another type of energy  (in a bulb: "light energy").  then the electrons flows to the positive end passing the bulb.

                  Bulb absorbs only the 'energy' contained in electron, not the electron. so the number of electrons came to the bulb is equal to the number of electrons goes to the positive end. And keep in mind that number of electrons which left the negative end must be equal to the number that reach the positive end in a certain time period . otherwise the battery do not let the electrons to leave the battery. 

figure 1.2

when the less energized electrons comes to the positive end of the battery, It charges the electrons to a high energy level. this energy is gained from the chemical energy which is stored in the battery. then it goes to the negative end (see figure 1.2) . 

these things are for your understanding. Actual process is somewhat different from this. but for beginners this clarification will give a better understanding.

please ignore my spelling mistakes. I need your comments. please leave your problem regarding this post as a comment.

pabindu lakshitha Eng (Hons) 

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