Voltage and Current Relationship

Question:                 How Voltage and current are related to each other? Answer:                 A charge is carried by electrons. The amount of charge flowing is called Current. Voltage is potential difference. i.e. in this picture water will flow from top to bottom. Similarly, current flows from high concentration of current to low concentration of...

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USB DESIGNS

USB stands for: Universal Serial Bus It is a portable device which is used to store data. it is available in different data storage capacity. The development of USB device began by a group of seven companies includes IBM, Intel, COMPAC, DEC, NEC and Microsoft. USB flash drive includes a flash drive with an integrated USB interface. it isused for same purpose such as data storage and data transfer from one computer to another lieother storage devices...

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LED Dot Matrix Dislplay

Parts List: IC CD4017 LED PIC16F877A Crystal 20 MHz Crystal socket R1 = 4.7k ...

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Questions. . . ! Single phase induction motor

Q1: Where do we require single-phase induction motors? Ans: Single-phase induction motors are required where (i) 3 phase supply is not available  (ii) efficiency is of lesser importance (iii) Rating is less than one H.P.  (iv) Equipment is portable Q2: Why is the power factor of a single-phase induction motor low? Ans: It is due to the large magnetizing current which ranges from 60% to 70% of full-load current. As a result, even at no-load, these motors reach temperatures close to the full-load temperature. Q3: What is the...

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Split – Phase Induction Motor

Split phase induction motor has two windings its stator, a main winding and an auxiliary winding or starting winding. The starting winding is located 90o electrical from the main winding and operates for a short time when the motor starts up. The two windings are so designed that the starting winding has a high resistance and relatively small reactance while the main winding has relatively low resistance and...

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A.C. Series Motor OR Universal Motor

§  A universal motor is built like a series d.c. motor with the difference that both its stator and armature are laminated. A universal motor is defined as a motor which can be operated on both a.c. supply and d.c. supply at approximately the same speed and output. §  A d.c. series motor (both armature and field windings are in series) can be operated on a single phase a.c. supply. It is then called an a.c. series motor. Following changes are made in d.c. series motor to operate satisfactory on a.c. supply. 1.    The entire...

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Single Phase Motors

"Single phase motors are also used to convert Electrical energy to mechanical energy but the difference is that they are operated on single phase supply". Types of single phase motors: Single phase motors are generally built in the fractional –horsepower range and are classified into following four basic types: Single-Phase Induction Motors       (i) Split-phase type      (ii) Capacitor type   ...

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