kumar ideology

Why we can’t store AC in Batteries instead of DC.or Can we store AC in batteries instead of DC? We  cannot store AC in batteries  because AC changes their polarity up to 50 (When frequency = 50 Hz) or 60 (When frequency = 60 Hz) times in a second. Therefore the battery terminals keep changing Positive (+ve) becomes Negative (-Ve) and vice versa, but the battery cannot change their terminals with the same speed so that’s why we can’t store AC in Batteries. in addition, when we  connect a battery with AC Supply , then It will charge during positive half cycle and discharge during negative half cycle, because the Positive (+ve) half cycle cancel the negative (-Ve) half cycle, so the  average voltage or current in a complete cycle is Zero . So there is no chance to store AC in the Batteries. If you want more books, slide, ppt's and notes,Request in the comment section. Visit the site for more knowledge and share this site link to the needy one....

Why AC systems are preferred over DC systems? Due to following reasons, AC systems are preferred over DC systems: a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. b. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission c. From power stations, AC is produced so it is better to use AC then DC instead of converting it. d. When a large fault occurs in a network, it is easier to interrupt in an AC system, as the sine wave current will naturally tend to zero at some point making the current easier to interrupt. Due to following reasons, AC systems are preferred over DC systems: a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. b. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission c. From power stations, AC is produced so it is be...

State the difference between generator and alternator Generator and alternator are two devices, which converts mechanical energy into electrical energy. Both have the same principle of electromagnetic induction, the only difference is that their construction. Generator persists stationary magnetic field and rotating conductor which rolls on the armature with slip rings and brushes riding against each other, hence it converts the induced emf into dc current for external load whereas an alternator has a stationary armature and rotating magnetic field for high voltages but for low voltage output rotating armature and stationary magnetic field is used.

a book of protection and switch gear by badriram CLICK HERE  TO DOWNLOAD THE BOOK . . . . . . ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ . . . . . https://drive.google.com/open?id=0B-xPXNqqPzIITnhpUzk1M25teUk . . . . . . . . If you want more book, slide, ppts and notes online you can request in the comment section , Visit this site for more books, slide, ppts, notes and share this site link with the needy one. Thank You

                                        MOVING IRON  • Moving-iron instruments are generally used to measure alternating voltages and currents.  • In moving-iron instruments the movable system consists of one or more pieces of soft iron, which are so pivoted as to be acted upon by the magnetic field produced by the current in coil. Components  • Moving element: a small piece of soft iron in the form of a vane or rod.  • Coil: to produce the magnetic field due to current flowing through it and also to magnetize the iron pieces.  • In repulsion type, a fixed vane or rod is also used and magnetized with the same polarity.  • Control torque is provided by spring or weight (gravity).  • Damping torque: the damping device consisting of an air chamber and a moving vane attached to the instrument spindle.  • Deflecting...