A complete Electrical Engineering portal
How does a transformer work? A transformer is an electric machine that converts AC voltage from one level to another level with minimum power loss. It is based on the principle of electromagnetic induction. A typical power transformer consists of two sets of coils – Primary coil and secondary coil. The rate of voltage transformation … Read more
Transformers are rated in kVA or VA and not in kilowatts. While electric loads such as motors, lamps, heaters, etc. are always rated in kW, equipment used for power generation and transmission (generators and transformers) are rated in kVA. This article illustrates why are transformers rated in kVA and why not it is rated in … Read more
Here are the most frequently asked transformer interview questions and their answers What is a transformer? By definition, a transformer is a static electrical device that transforms electric energy from one level to another level. Normally transformers are used to step up or step down voltage and current levels, impendence matching and providing electrical isolation … Read more
Safety is the primary element of any circuit or electrical connection. Whether it is electric iron or refrigerator or any other home appliances, everywhere safety has to be ensured to protect the people getting in contact with them from electrocution. The question, “why one of the pins in a three-pin plug is longer and thicker … Read more
This article focus on explaining the similarities and dissimilarities between neutral and earth (ground). Understanding the difference between neutral and earth may be difficult in the beginning. A Lot of safety and protection-related aspects need to be carefully studied for a better understanding of the difference between them. Note: For this article, let us consider … Read more
Over-current and overload are abnormal conditions occurring in a circuit. This article well explains the difference between over-current and overload. Difference between over-current and overload Over-current Any situation in which the current flow through a device or conductor exceeds the desired value is known as over current. Both overload and short circuit can cause excessive … Read more
Short Circuit A short circuit occurs when two or more current-carrying conductors of different phases or different voltage levels or different terminal (in DC circuits) come in contact with each other or with the ground. It is an abnormal condition during which current shoots up several times the permissible limits. Read about short circuits in … Read more
An Ammeter is a device used to measure the current flow through a conductor. The name is derived from the unit of current, Ampere. This article explains why is ammeter connected in series but not in parallel. An ammeter is either connected in series to the line along which the flow of current is measured … Read more
Commissioning of variable speed drive is the process of checking, inspecting, testing, and configuring the equipment at the project site so that it shall fulfill the technical and functional requirements of the customer. This makes the equipment ready for safe operation. This article explains the Commissioning procedure for VFD. Why is commissioning of variable frequency … Read more
In an AC power system, the power factor is a very important parameter that defines how efficiently electrical power is being utilized by the load. It is a rational number between -1 and 1 but has no unit. The p.f of a system depends on the type of load present, whether resistive, inductive, or capacitive. … Read more
