Measurement of Resistance
The instrument or device used to find the resistance of earth is known as Earth Tester or Earth Resistance Tester. Every equipment in the power system is earthed to ensure protection for both the system and personnel. Earthing is…
The earthing of every part of electrical equipment is very important for domestic and as well as industrial applications. Therefore the measurement of resistance of earth connection or earth plate or earth electrode is very impor…
The different methods employed for measurement of high resistance are, Loss of charge method Direct deflection method By using Megger. In the last article, we have seen measurement high resistance using the loss of charge method.…
There are several electrical equipments that possess high resistance. Some of the equipment like the insulation resistance of cables and machines, high resistance circuits like vacuum tubes, leakage resistance of the capacitor, t…
The Loss of Charge Method is used to measure resistance greater than 100KΩ or 0.1MΩ. The drawback of the Wheatstone bridge is that, it cannot be used to measure the high value of resistance of the order of 1MΩ because of the redu…
Wheatstone bridge is the most common, accurate, and reliable method, used for the measurement of medium resistance. The principle of operation of the Wheatstone bridge is based on the null deflection. It is used to determine unkn…
An Ohmmeter is an electrical instrument by which we can measure the resistance of any electrical circuit component directly. It can also be used to check the continuity of the circuits. The accuracy of ohmmeters is moderate, it g…
Carey Foster's bridge is an electrical circuit used to measure the medium value of resistance or resistances which are nearly equal in their value. The construction of Carey Foster's bridge circuit is similar to the Wheat…
The various methods used for measuring the resistance of medium values (i.e., 1Ω to 100kΩ) are, Ammeter-voltmeter method Ohmmeter method Substitution method Wheatstone bridge method Carry-foster bridge method Let us see how unkno…
The Kelvin bridge or Thompson bridge is one of the methods of measuring the value of unknown resistance less than 1Ω. It is the most accurate method of measuring low resistance compared to other methods. Kelvin's double bridg…
