Electrical Geeks

Transformer In a transformer, Source of alternating current is applied to the primary winding. Due to this, the current in the primary winding (called as magnetizing current) produces alternating flux in the core of transformer. This alternating flux gets linked with the secondary winding, and because of the phenomenon of mutual induction an emf gets induced in the secondary winding. Magnitude of this induced emf can be found by using the following EMF equation of the transformer. EMF equation of the Transformer: Let, N 1 = Number of turns in primary winding N 2 = Number of turns in secondary winding Φ m = Maximum flux in the core (in Wb) = (B m x A) f = frequency of the AC supply (in Hz) As, shown in the fig., the flux rises sinusoidally to its maximum value Φ m from 0. It reaches to the maximum value in one quarter of the cycle i.e in T/4 sec (where, T is time period of the sin wave of the supply = 1/f). Therefore, average rate of change of fl...

Coulomb’s Law-Explanation Statement Formulas Principle Limitations Charles Augustin de Coulomb Coulomb's law, or Coulomb's inverse-square law, is a law of physics describing the electrostatic interaction between electrically charged particles. The law was first published in 1785 by French physicist Charles Augustin de Coulomb and was essential to the development of the theory of electromagnetism. It is analogous to Isaac Newton's inverse-square law of universal gravitation. Coulomb's law can be used to derive Gauss's law, and reverse can be possible. The law has been tested heavily, and all observations have upheld the law's principle. Coulomb's law statement: 1st law:  The force is along the straight line joining them. If the two charges have the same sign, the electrostatic force between them is repulsive ; if they have different sign, the force between them is attractive 2nd law: The magnitude of the electrostatic...

Lemon Battery The lemon battery is a simple type of electrical battery that is commonly made for school science projects because it illustrates a battery's main components. Typically, a piece of zinc metal and a piece of copper metal are inserted into a lemon. Everyday objects such as galvanized nails and copper pennies can be used for the zinc and for the copper. A single lemon is usually studied using an electrical meter. Several lemons can be wired together to form a more powerful battery that will power a light-emitting diode, a buzzer, or a digital clock. The lemon battery is similar to the first electrical battery invented in 1800 by Alessandro Volta in Italy. Volta used brine (salt water) instead of lemon juice. The lemon battery is described in some textbooks in order to illustrate the chemical reactions that occur in batteries. The zinc and copper are called the electrodes of the battery, and the juice inside the lemon is called the electrolyte. There are many variat...