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Fig. 1: Eddy current dynamometer.

Working Principle of Eddy Current Dynamometer

Eddy current dynamometer is electrical absorption dynamometer working on principle that, when isolated conductor moves through magnetic flux, it induces eddy current, which get dissipated in the form of heat. Continue reading What is Eddy Current Dynamometer? Working, Diagram, Construction & Applications

Figure 1: Liquid in Glass Thermometer.

Construction & Working of Liquid in Glass Thermometer

Liquid in Glass Thermometer consists of glass envelope filled in with liquid and calibrated indicating scale marked on it. The envelope comprises a thick walled glass tube with a capillary bore and a spherical or cylindrical bulb filled with liquid. Continue reading What is Liquid in Glass Thermometer? Working, Diagram, Construction & Advantages

Fig. 1: Bimetallic Thermometer (Bimetallic strip in spiral form)

Working Principle of Bimetallic Thermometer

Two different materials having different coefficient of thermal expansion rigidly joined together, one on other to form a bimetallic strip.  Continue reading What is Bimetallic Thermometer? Working Principle, Diagram, Construction & Applications

McLeod gauge is a low pressure gauge and it is employed for the measurement of vacuum pressures.

Figure 1: McLeod Gauge. Continue reading What is McLeod Gauge? Working Principle, Diagram, Construction & Advantages

Figure 1: Hot-Cathode Ionization Gauge.

Working Principle of Ionization Gauge

The basic principle of an ionization gauge is the electrons emitted from a cathode strikes a gas molecule and knocks out an electron from it. Thus the gas molecule remains as a positively charged ion and carries a current called ion current. This current become a measure of the applied pressure when calibrated. Continue reading What is Ionization Gauge? Working Principle, Diagram, Construction & Applications

Working Principle of Thermocouple Vacuum Gauge

The operating principle of thermocouple Vacuum Gauge is that the conducting ability of gas in vacuum or low pressure depends on the pressure i.e., it is a function of pressure. The measurement of vacuum using  thermocouple gauge is shown in figure 1.

Figure 1: Thermocouple Vacuum Gauge. Continue reading What is Thermocouple Vacuum Gauge (or Thermocouple Conductivity Gauge)? Working Principle, Diagram, Construction & Applications

Semiconductor Strain Gauge is also called piezo-resistive strain gauges. These are made up of doped silicon and germanium which have crystalline structure. When subjected to strain, resistivity of this material changes. This property is called piezo-resistive property.

(i) Continue reading What is Semiconductor Strain Gauge? Working Principle, Diagram & Gauge Factor