http://unionroguerivercamp.com/nqz/nhsf.php VFD stands for Variable Frequency Drive. VFD is used to speed control of AC induction motors and protect the motors. A VFD can also control the speed of motor during start and stop cycle, as well as throughout the run cycle. VFD is also known as VVVFD. The meaning of VVVFD is Variable Voltage Variable Frequency Drive. It […]

# Why transformers and alternators rated in KVA, not in KW?

http://livedcmetro.com/arlington-real-estate/?share=facebook Usually we have seen that transformers and generators are rated in KVA instead of KW. We Know that KVA is a product of voltage and current and KW is a product of voltage, current and power factor. For better understanding of this topic first you have to know there are three types of loads Resistive, […]

# Torque Equation For DC Motor

http://greatamericancomicconvention.com/john-beatty/ Torque Equation for DC Motor Torque is a rotational force that helps for rotating the armature of DC motor. Torque is produced by electromagnetic effect. In simple words we can say that, when a conductor carrying current placed in a magnetic field or flux a mechanical force experienced by the conductors and conductor moves in […]

# Lead Acid Battery

Lead Acid Battery There are two types current namely ac and dc. We know that, DC current can be stored. The electrical energy in dc nature store in the form of chemical energy. The device that stores electrical energy in chemical energy is called “electric cell“. Electric cell has small storage capacity. So cells are connected […]

# Superposition Theorem

Superposition Theorem This theorem is useful for those circuits that contain two or more than two sources. This theorem is applicable only when network or circuit contains with linear elements. The sources of emf connected only in parallel not in series. According to this theorem the current flowing through any section is the algebraic sum […]

# Insulating Materials

Insulating Materials Insulating materials are the materials that is able to insulate. It prevent the current flows through them. The materials that posses insulating properties is called an insulator. In this article, we will study about classification, Properties, applications of insulating materials. Classification of insulating Materials Insulating Materials are divided into three types Solid insulating […]

# Introduction to Electrical Machines

Electrical Machines Electrical Machines are the machines that required electrical energy for their operation. These machines may be ac or dc (means what kind of supply requires for their operation). The ac machines are two types static and rotating machines. On the other hand dc machines are only rotating one. In this article we will […]

# Graph Theory

Graph Theory When all the elements in a circuit or network are replaced by lines with dots, such configuration is called graph of the network. The all elements such as capacitor, inductor or resistor must satisfy Kirchhoff’s laws. Based on these laws, we can form a number of equations in graph theory. Terminology Used in […]

# Power Transformer and Distribution Transformer

Power Transformer and Distribution Transformer Transformer plays an important role in the area of electrical engineering. Transformer is used either for raising or lowering the voltage of ac supply. It is used at electrical energy generating station where basically it raise the voltage level of an ac supply and it is also used at substations […]

# Transformer on No-Load

Transformer on No-Load Transformer on No-Load transformer, there is no iron losses and copper losses. The ideal transformer is not practically possible. In case actual transformer these losses are present. When an actual transformer put on load, there is iron loss in the core and copper loss in the windings. When secondary of the transformer […]