Let’s try to review the potential difference between two points in an electrical field before explaining what is electrical energy. Suppose the potential difference between point A and point B is V volt. Based on the definition of potential difference, we can say that if one positive electrical load unit that is a body that contains one – coulomb positive load travels from point A to point B, it will… Read More »
An element’s ability to deliver its outermost electrons to form positive ions is manifested in the amount of energy supplied to its atoms sufficiently to remove the electrons from it. This energy is known as the ionization energy. Simply, the Ionisation Energy is the energy supplied to an atom or molecule to knock out its most loosely bound… Read More »
Cables are classified depending upon the material used for insulation such as paper, rubber or asbestos. Paper tapes of about 10 cms to 15 cms thickness can be wound on to a conductor in successive layers to achieve a required operating voltage and is used for voltages of 10 kV and above. In the mass-impregnation construction the paper… Read More »
The word feeder here means the connecting link between two circuits. The feeder cod be in the form of a transmission line, short, medium or long, or this could be a distribution circuit. The various methods of protecting the feeders are: 1. Over current protection. 2. Distance protection. 3. Pilot relaying protection. of these, overcurrent protection is the… Read More »
In polyphase circuit, the energy can be measured by a group of single-phase energy meters as required by Blondel’s theorem. As per Blondel’s theorem, the total energy consumed is the sum of readings of all energy meters. However, in actual practice this is never done. In commercial, measurement, polyphase meters used which are constructed by combining two or… Read More »
Attraction type MI Instrument- The current to be measured is passed to the fixed coil. The spindle is fixed to the moving iron is kept near the hollow fixed coil. When the d.c. current flows through the terminal, a magnetic field is produced by the fixed coil. By the magnetic induction, the moving iron gets magnetized. The south… Read More »
In a power system various component are meet at buses. The generators feed energy to buses and loads draw energy from buses. In the network of a power system the buses become nodes and so a voltage can specified for each bus. So, each bus in a power system is associated with four quantities and they are real… Read More »
Introduction: The most important difference between a de. And a.c. potentiometer is that, in a d.c, potentiometer, only the magnitude of the unknown emf and potentiometer voltage drop have to be made equal to obtain balance. But in a.c. potentiometer, both magnitude and phases of unknown emf and potentiometer voltage drop have to be same to balance. The… Read More »
Construction: It consists of a fixed coil FF (split into two parts) which carries the current of the circuit under test. So, the magnetic field produced by this coil is proportional to the main current. The identical pressure coils A and B pivoted on a spindle constitutes the moving system. Pressure coil A has a non-inductive resistance R… Read More »
