Methods for measurement of low resistance:
1. Ammeter voltmeter method
2. Kelvin’s bridge method
3. Ohm meter method
4. Potentiometer method
5. Digital/analog multi-meter method.
Methods for measurement of medium resistance:
1. Ammeter voltmeter method
2. Digital/analog multi-meter method.
3. Wheatstone bridge method
4. Substitution method.
5. Carry- foster method
Methods for measurement of high resistance:
1. Direct deflection method
2. Loss of charge method
3. Megger
Advantages of V-I method:
1. Simple and economical method
2. Reasonably accurate
3. Instruments for test are easily available.
Limitation of V- I method:
1. Ammeter resistance must be zero and voltmeter resistance must be infinity for perfectly accurate measurement which is not possible.
2. Connection errors.