What is the difference between an AC motor and a DC motor?

While both A.C. and D.C. motors serve the same function of converting electrical energy into mechanical energy, they are powered, constructed and controlled differently. 1 The most basic difference is the power source. A.C. motors are powered from alternating current (A.C.) while D.C. motors are powered from direct current (D.C.), such as batteries, D.C. power supplies or an AC-to-DC power converter. D.C wound field motors are constructed with brushes and a commutator, which add to the maintenance, limit the speed and usually reduce the life expectancy of brushed D.C. motors. A.C. induction motors do not use brushes; they are very rugged and have long life expectancies. The final basic difference is speed control. The speed of a D.C. motor is controlled by varying the armature winding’s current while the speed of an A.C. motor is controlled by varying the frequency, which is commonly done with an adjustable frequency drive control.

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गरुड़ पुराण कथा और सार – Garud Puran in Hindi

गरुड़ पुराण कथा और सार – Garud Puran in Hindi गरुड़ पुराण कथा – Garud Puran in Hindi गरुड़ पुराण हिन्दू धर्म के प्रसिद्ध वेद पुराण में से एक है। वैष्णव सम्प्रदाय से सम्बन्धित गरुण पुराण हिन्दू धर्म में मृत्यु के बाद सद्गति प्रदान करने वाला माना जाता है। इसलिये सनातन हिन्दू धर्म में मृत्यु के बाद ‘गरुड पुराण’ के श्रवण का प्रावधान है। इस पुराण के अधिष्ठातृ देव भगवान विष्णु हैं। अठारह पुराणों में ‘गरुड़ महापुराण’ का अपना एक विशेष महत्व है। क्योंकि इसके देव स्वयं विष्णु माने जाते हैं, इसीलिए यह वैष्णव पुराण है। गरुड़ पुराण के अनुसार हमारे कर्मों का फल हमें हमारे जीवन में तो मिलता ही है, परंतु मरने के बाद भी कार्यों का अच्छा-बुरा फल मिलता है। इसी वजह से इस ज्ञान को प्राप्त करने के लिए घर के किसी सदस्य की मृत्यु के बाद का अवसर निर्धारित किया गया, ताकि उस समय हम जन्म-मृत्यु से जुड़े सभी सत्य जान सके और मृत्यु वश बिछडऩे वाले सदस्य का दुख कम हो सके। भगवान विष्णु की भक्ति | Devotion to Lord Vishnu वास्तविक तथ्य यह है कि ‘गरुड़ पुराण’ में भगवान विष्णु ...

What is OLAP (Online Analytical Processing): Cube, Operations & Types

What is OLAP (Online Analytical Processing): Cube, Operations & Types What is Online Analytical Processing? OLAP is a category of software that allows users to analyze information from multiple database systems at the same time. It is a technology that enables analysts to extract and view business data from different points of view. OLAP stands for Online Analytical Processing. Analysts frequently need to group, aggregate and join data. These operations in relational databases are resource intensive. With OLAP data can be pre-calculated and pre-aggregated, making analysis faster. OLAP databases are divided into one or more cubes. The cubes are designed in such a way that creating and viewing reports become easy. In this tutorial, you will learn- What is Online Analytical Processing? OLAP cube Basic analytical operations of OLAP Types of OLAP systems ROLAP MOLAP Hybrid OLAP Advantages of OLAP Disadvantages of OLAP OLAP cube: At the core of the...

Communication is simply the act of transferring information from one place, person or group to another.

Communication is simply the act of transferring information from one place, person or group to another. Every communication involves (at least) one sender, a message and a recipient. This may sound simple, but communication is actually a very complex subject. The transmission of the message from sender to recipient can be affected by a huge range of things. These include our emotions, the cultural situation, the medium used to communicate, and even our location. The complexity is why good communication skills are considered so desirable by employers around the world: accurate, effective and unambiguous communication is actually extremely hard. A communication therefore has three parts: the sender, the message, and the recipient. The sender ‘encodes’ the message, usually in a mixture of words and non-verbal communication. It is transmitted in some way (for example, in speech or writing), and the recipient ‘decodes’ it. Of course, there may be more than one recipient, and t...

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