tion:ABOUT ALTERNATING CURRENT :The alternating current having a great mystery during the time late 18th century .When Two great scientist Nicola Tesla and Thomas Alva Edison fight due to current in business.Thomas edison invented D.C source of current which use during that time but this current can,t be sent to long distance and direction if this current can,t be reverse these are problem with D.C source.Nikola Tesla invented an induction motor , type of generator and transformer of A.C power transmissionAlternating current is an electric current in which MAGNITUDE of current and direction reverse periodically in compare to D.C source in which current flow in only one direction .The Wave of A.c power circuit is sine wave because this leads to the efficient transmission of energy.During that time alternating current is more efficient then Direct current because of its long transfer of current and in required magnitude of current.HOW ALTERNATING CURRENT WORK :A.C power is cheaper and easier to make electronic device A.C can be used high voltage with SMALLER ( low ) current to reduce WASTAGE of energy in currentA.C reduce the heating in the wire by high voltage in current.NOTE : A.C GENERATOR Work on the principle of electromagnetic inductionPRINCIPLE :In generator , a coil rotate in a magnetic filed . Due to rotation , the magnetic flux linked with the coil change and therefore an emf is induced between the end of coil. THUS a generator acts as a source of current in external circuit containing load when it is joined between the end of its coil.Thank you