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Power Factor Correction

Power Factor Correction

The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.

Equipments Used to Measure Body Temperature

Equipments Used to Measure Body Temperature

Body temperature can be assessed using various devices and measured in Celsius or Fahrenheit.
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...

Temperature Measurement Sites

Temperature Measurement Sites

A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...

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Related Experiment Video

Updated: Jun 10, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Temperature dependent thermoelectric material power factor measurement system.

Jonathan D'Angelo¹, Adam Downey, Timothy Hogan

¹Michigan State University, 2120 Engineering Building, East Lansing, Michigan 48823, USA. dangelo4@msu.edu

The Review of Scientific Instruments

|August 7, 2010

Summary

A new system measures the power factor of thermoelectric materials from 300 K to 1273 K. This enables efficient characterization for waste heat to electricity conversion and cooling applications.

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Area of Science:

Materials Science
Solid State Physics
Energy Conversion

Background:

Thermoelectric materials offer promising applications in waste heat recovery and solid-state cooling.
Accurate characterization of thermoelectric properties, including electrical conductivity and thermopower, is crucial for material development.
Existing characterization methods may have limitations in temperature range or efficiency.

Purpose of the Study:

To design and construct a novel system for measuring the power factor of thermoelectric materials.
To enable comprehensive characterization of thermoelectric materials across a wide temperature range (300 K to 1273 K).
To present the performance and characterization results of the developed measurement system.

Main Methods:

Development of a custom-built apparatus for simultaneous measurement of electrical conductivity and thermopower.
Implementation of precise temperature control and measurement capabilities from room temperature up to 1273 K.
Validation of the system's performance through characterization of known thermoelectric materials.

Main Results:

The developed system successfully measures the power factor of thermoelectric materials within the specified temperature range.
Characterization results demonstrate the system's accuracy and reliability for evaluating thermoelectric performance.
The system facilitates efficient assessment of novel thermoelectric materials for energy applications.

Conclusions:

The presented system provides a robust platform for the characterization of thermoelectric materials.
This advancement supports the discovery and optimization of materials for efficient thermoelectric energy conversion and cooling.
The ability to measure the power factor over an extended temperature range is critical for practical thermoelectric device development.