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Why Earth Pin is Bigger and Thicker?

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You must have seen a plug or a socket in which  one pin or point is big and thick as compared to other two pins  which are equal to each other.  So why is that soo ? Here is the Answer to your question So there are basically 3 major reason behind this and lets have a look over these. 1 . Plug is inserted Properly-  The plug consists 3 pin so if all pins will be equal then someone might put earth pin in the phase or neutral due to which connection will get wrong and if Earth pin is connected to phase then the current will flow in the machine outer body which can cause major damage to one touching it. 2. Earth pin will enter first and exits last-  As we know earth pin is used to protect us from any leakage current in any machine's conductive body. So we must put earth pin before Phase to be safe from any fault current occurring later,and due to this only Earth pin is taken out at last so that if any fault currrnt is their then firstly supply is disconn...
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Why Series connection is not used in house??

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So we all are aware of series and parallel connections. So have you ever thought of which connection from both of them are used in our houses and which are more suitable?? So here is the answer to your question.. So as we know in series connection if we connect two appliances together then two or more appliances are connected from head to tail with each other which result in same current in both the appliances. But the drawback comes here that if any single appliances get failed then the current will not be able to move further which can result in no current forward. For example: if we connect one fan and one bulb together in series and if we switch ON both of them and somehow Fan do not work then the power will not transferred further and bulb will also not glow. But now in the case of parallel connection the appliances are joined parallely due to which the current are different in different branches according to the need of electrical appliances so if any appliances get failed then i...
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What is Autotransformer? Advantage Disadvantage and Application

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Auto transformers is an single winding device,In which power is transferred inductively as well as conductively.The working principle of auto transformer is same as conventional two winding transformer. ADVANTAGES: 1.It is portable 2.Efficiency is high 3.Voltage regulation is superior 4.Copper loss is less 5.Resistance and leakage reactance is less 6.Less copper material is required hence cost as well as size is less compared to two winding transformer. DISADVANTAGES: 1. Impedance is low Hence short circuit current will flow for the short circuit in secondary winding. 2. If a section of a winding common to both primary and secondary is open full primary voltage appears across the secondary resulting higher voltage on secondary which is dangerous. 3. Do electrical separation between primary and secondary which is risky in case of high voltage level. APPLICATION: 1. Used as starter for rotating device. 2. Used as variac. 3. Used as a furnace transformers for getting required voltage supp...
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