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mechanical frawing instrument
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Types of mechanical instruments
Types of mechanical instruments 1)Active and passive instrument. The instrument which require external power for manipulation and measurement is generally known as a active instrument. eg.potentiometer. The instrument which does not require external power for manipulation and measurement is generally known as a Passive instrument. eg. Liquid level measurement using fload and gear arrangement 2)Analog and digital instrument: The analog instrument in which the output can have an infinite number of values within the range that the instrument is designed to measure.eg.voltmeter The analog instrument in which the output can have an finite number of values within the range that the instrument is designed to measure. eg .electronic speedmeter 3)Null type and deflection type instruments: In the deflection type instrument quantity being measure displayed in terms of the amount of Pointers deflection Eg.pressure gauge. In null type instrument measurement is done...
Wiedemann and Franz Law
This law is generally related to the conductivity. According to this law Ratio of thermal conductivity and electrical conductivity is the same for all metals at the same temperature and this ratio is directly proportional to absolute temperature.