A very small resistance 100 m ohm is measured using kelvin double bridge. The standard resistor is 300 micro ohm. The inner ratio arms are 100 ohm and 300 ohm. The outer ratio arms are 200 ohm and 350 ohm. The resistance of link is 800 micro-ohm. Evaluate the unknown resistance.

A very small resistance 100 m ohm is measured using kelvin double bridge. The standard resistor is 300 micro ohm. The inner ratio arms are 100 ohm and 300 ohm. The outer ratio arms are 200 ohm and 350 ohm. The resistance of link is 800 micro-ohm. Evaluate the unknown resistance.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter13: Heating Control Devices

Section: Chapter Questions

Problem 28RQ

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Concept explainers

Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.

Question

A very small resistance 100 m ohm is measured
using kelvin double bridge. The standard resistor
is 300 micro ohm. The inner ratio arms are 100
ohm and 300 ohm.
The outer ratio arms are 200 ohm and 350 ohm.
The resistance of link is 800 micro-ohm. Evaluate
the unknown resistance.

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