# resistance measuring unit

National Instruments VirtualBench VB-8034 Specifications - NI » Caution Do not use this device for connection to signals or for measurements within Measurement Categories III or IV.… Resistance, diode. Up to 300 V DC. DC … Ni.com

 In an experiment with a potentiometer, VB = 10V. R is adjusted to be 50 Ω. A student wanting to measure voltage E1 of a battery finds no null point possible. He then diminishes R to 10 Ω and is able to locate the null point on the last segment of the potentiometer. Find the resistance of the potentiometer wire and potential drop per unit length across the wire in the second case. - India Site » Equivalent resistance of the potentiometer = 50 Ohm + R’ Equivalent voltage across the potentiometer = 10 V Current through the main circuit I = 10/(50 Ohms +R’) Potential difference across wire of potentiometer is: When 50 ohms resistors is used 2R’ < 400 R’ < 200 Ohms When 10 Ohm resistor is used 160 […] Learnatnoon.com

Switchgear and Switchboard Inspection and Testing Guide » Substations and switchgear in an electrical system perform the functions of voltage transformation, system protection, power factor correction, metering, and circuit switching. Electrical power apparatus, such as transformers, regulators, air switches, circuit breakers, capacitors, and lightning arresters, comprise the components necessary to perform these functions. This guide provides a general overview of the inspection, testing, and maintenance techniques used on switchgear and switchboa… Wiki.testguy.net