Four terminal approach is used in measuring low resistance because it -
Eliminates the effect of leads and currents
R = (V)/(I) Because the voltage (V) is measured precisely across the resistance element, excluding the voltage drops in the current leads and contacts, this method effectively eliminates the influence of lead and contact resistances on the measurement of the low resistance value. Eliminates the effect of leads and currents:
Important Questions from Measurement of Resistance
Which of these instruments is used for measuring the insulation resistance?
A ______ is a combined unit of ampere meter, voltmeter and ohmmeter.
A zero to 300 V voltmeter has an error of 2% of the full scale deflection. If the true voltage is 30 V, then the range of readings on this voltmeter would be
The operating voltage of a megger is about
Which instrument is used to measure the high resistance?
