Basically, electric measurement means measurement of current, voltage and resistance in a circuit.We have already discussed that a voltmeter is used for measuring current. Both of these instruments work on ohm's law. The fundamental law in current electricity. Certainly, we did not discuss about the measurement of resistance. The instrument to the a resistance is called ohmmeter. An ohmmeter ,in fact, is a combination of a voltmeter and ammeter. It is important to note that all of these electrical instruments use energy from the source of electricity of which they are doing the measurement. It is, therefore, there fore, the measurements taken by them are slightly different from the actual measurements . In other words, some accuracy of measurement is lost with these instrument.
Hence , if we need move accuracy in the electrical measurement,we use potentiometer and Wheatstone bridge for the measurement of electricity. These devices use elaborate circuits for the measurement. However, these devices are much more accurate them the other.
In this sub-unit,we discuss in detail the principle and applications of accurate electrical devices.
Hence , if we need move accuracy in the electrical measurement,we use potentiometer and Wheatstone bridge for the measurement of electricity. These devices use elaborate circuits for the measurement. However, these devices are much more accurate them the other.
In this sub-unit,we discuss in detail the principle and applications of accurate electrical devices.
No comments:
Post a Comment