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Wizara ya Afyayanzibar Yakabidhiwa Pikipiki Tano kwa Ajili ya Wakuu wa...
Mwakilishi wa Shirika la Kuhudumia Watoto (Save The Children) Bi Mali lisson, akitowa maelezo kabla ya kukabidhi Pikipiki kwa Wakuu wa Kitengo cha Mkono kwa Mkono wakati wa hafla hiyo iliofanyika...
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Induction Heating Transformers
The principle of induction can be used for heating purposes. The principle of induction heating is shown in the Fig.1. Fig. 1 When alternating current flows in a conductor it produces...
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Isolation Transformers
All the transformers are basically isolation transformers as they provide electrical isolation between primary circuit and secondary circuit. But most of them either step up or step down the voltage...
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Ferrite Core Type Transformer
The transformer working is mainly dependent on its core design. The magnetic core is the heart of the transformer. Generally speaking, there are some properties to be considered in core materials,...
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Welding Transformers
Most of the power supplies available now are a.c. Therefore a transformer for welding is most commonly used as compared to motor-generator set. Moreover motor-generator set has to be kept in the...
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Phase Shift Transformer
In this type of transformer, a laminated silicon steel stator consisting of either two phase or three phase winding similar to that in case of induction motor. A typical drysdale phase shifting...
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Pulse Transformer
The pulse transformer is a basically a transformer which couples a source of pulses of electrical energy to the load with its shape and other properties maintained. The pulses may be respective or...
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Variable Frequency Transformer
Small transformers (usually iron-cored) are used for coupling purpose in electronic circuits for communication, measurement and control. These transformers process signals which contain a wide ban of...
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Grounding Transformer
If a neutral point is required or not available in case of delta connections and bus bar points, a zig-zig transformer is used. Earthed transformer are used for providing the neutral pint for such...
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Audio Frequency Transformer
Audio-frequency transformers are used mainly for matching impedances and transmitting audio frequencies. They also provide isolation from direct currents and present balanced impedances to lines or...
View ArticleDucati To Introduce Nine New Models In 2016
The Monster 1200 R starts the list, and will be joined by 8 other new models that would join the 2016 Ducati lineup, announced Ducati CEO, Claudio… Visit the link above to read the full story. [via...
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Basic D.C. Ammeter
The basic d.c. ammeter is nothing but a D’Arsonval galvanometer. The coil winding of a basic movement is very small and light and hence it can carry very small current. For large currents, the...
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Electrodynamometer Type Instruments
The electrodynamometer type instrument is a transfer instrument. A transfer instrument is one which is calibrated with a d.c. source and used without any modifications for a.c. measurements. Such a...
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Moving Iron Instruments
The moving iron instruments are classified as: i) Moving iron attraction type instruments and ii) Moving iron repulsion type instruments 1.1 Moving iron attraction type instruments The basic...
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Permanent Magnet Moving Coil Instruments (PMMC)
The permanent magnet moving coil instruments are most accurate type for d.c. measurements. The action of these instruments is based on the motoring principle. When a current carrying coil is placed in...
View ArticleElectrical Instruments Introduction
The measurement of a given quantity is the result of comparison between the quantity to be measured and a definite standard. The instruments which are used for such measurements are called measuring...
View ArticleClassification of Measuring Instruments
Electrical measuring instruments are mainly classified as: a) Indicating Instruments b) Recording Instruments c) Integrating Instruments a) Indicating Instruments: These instruments make use...
View ArticleDeflecting System
In most of the indicating instruments the mechanical force proportional to the quantity to be measured is generated. This force or torque deflects the pointer. The system which produces such a...
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D’Arsonval Galvanometr
The use of D’Arsonval galvanometer is very common in variety of measuring instruments. The galvanometer is basically used in an instrument for detecting the presence of small voltages or currents in...
View ArticleEssential Requirements of an instrument
In case of measuring instruments, the effect of unknown quantity is converted into a mechanical force which is transmitted to the pointer which moves over a calibrated scale. The moving system of such...
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