The Info Of Electrical Energy

Definitions Concerning Magnetic Circuit 1.Magneto motive force (m.m.f.).  It drives or tends to drive flux through a magnetic circuit and corresponds to voltage (e.m.f.) in an electrical circuit. M.M.F. is capable the work drained joules in carrying a unit magnetic pole once through the complete magnetic circuit....

Force Between Two Parallel Conductors (i) Currents within the same direction (i) Currents within the same direction. In Fig. 6.23 area unit shown 2 parallel conductors P and alphabetic character carrying currents I1 and I2 amperes within the same direction i.e. upwards. the sphere strength within the area between...

Weber and Ewing’s Molecular Theory This theory was 1st advanced by Weber in 1852 and was, later on, more developed by Ewing in 1890. the fundamental assumption of this theory is that molecules of all substances ar inherently magnets in themselves, every having a N and S pole.  In AN unmagnetised state, it's...

Capacitor A capacitance basically consists of 2 conducting surfaces separated by a layer of Associate in Nursing insulating medium referred to as insulator.  The conducting surfaces could also be within the sort of either circular (or rectangular) plates or be of spherical or cylindrical form.  The purpose...

Synchronous Speed  The rotating magnetic field made by 3 section windings may are made by rotating a permanent magnet’s north and South Pole at synchronous speed, (shown as N and S at the ends of the flux phasors in Figures twenty two.1(b), (c) and (d)). For this reason, it's referred to as a 2-pole system And an induction...

Production of a Rotating Magnetic Field When a three-phase offer is connected to symmetrical three-phase windings, the currents flowing within the windings manufacture a magnetic field. This magnetic field is constant in magnitude and rotates at constant speed as shown below, and is termed the synchronous speed. With...

Speed Control of D.C. Motors Shunt-wound motors The speed of a shunt-wound d.c. motor, n, is proportional to VIaRa/8 (see equation (21.9)). The speed is varied either by varied the worth of flux, 8, or by varied the worth of Ra. the previous is achieved by employing a resistance nonparallel with the field winding, as shown...