ELECTRICAL PROPERTIES OF AB MATERIALS

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PRPERTIES OF AB MATERIALS

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Grace Balahay

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ELECTRICAL PROPERTIES OF AB MATERIALS


ELECTRICAL PROPERTIES OF AB MATERIALSVersion en ligne PRPERTIES OF AB MATERIALS par Grace Balahay 1 ▪ The extent an object conducts electricity. ▪ Potential for a substance to conduct electricity. ▪ Measure of how easily electrical current can pass through a material. a Electrical Conductance b Electrical Resistance c Capacitance d Dielectric Properties 2 refers to the amount of energy transmitted through a material or substance. a Conductance b Dielectric Properties c Capacitance d Electrical Resistance 3 Conductance expressed in units of a seimens b ohm c meter d current 4 Inverse or reciprocal conductance a electrical conductance b capacitance c Electrical Resistance d permittivity 5 Ability of a material to collect and store energy in the form of an electrical charge. a capacitance b conductance c resistance d permittivity 6 collects energy (voltage) as current flows through an electrical circuit. it is energy-storing devices available in many sizes and shapes a capacitors b conductors c resistors d voltage 7 These are defined as a molecular property that is fundamental in all the materials that are capable of impending electron movement resulting in polarization within the material on exposure to an external electric field. a dielectric properties b capacitance c resistance d electrical properties 8 are non-metallic and non-conducting materials which stores electrical charges. a dielectric materials b dielectric properties c electrical materials d electric field 9 is related to the capacitance of a substance. ▪ It is the ratio of the electric permeability of the material to the electric permeability of free space, such as in a vacuum condition. a dielectric constant b dielectric properties c dielectric materials d electric constant 10 is related to energy losses when the food is subjected to an alternating electrical field. ▪ It is a measure of the loss of energy in a dielectric material through conduction, slow polarization currents, and other dissipative phenomena. a dielectric loss b dielectric constant c dielectric material d dielectric properties 11 Electric and magnetic disturbance traveling through a space at the speed of light. The electromagnetic exhibits a dual wave and particle nature. a electromagnetic radiation b electromagnetic field c dielectromagnetic radiation d dielectromagnetic field 12 excellent absorbers of microwave energy a water and high moisture foods b dry materials c ice d low moisture food 13 poor absorbers of microwave energy a dry materials and ice b high moisture foods c water d drinks 14 utilizes electrical conductance, capacitance, or resistance of grains to measure rapidly the moisture content a moisture meter b moisturizer c moisture content d ph meter 15 electrical conductivity and capacitance _____with water content Choose one or more answers a increases b decreases c no effect 16 electricity is transformed to thermal energy when an alternating current (ac) flows through food. a ohmic heating b thermal heating c heating electrodes d product heating 17 However, the nature of a material is not the only factor in resistance and conductance, however; it also depends on the size and shape of the material because these properties are ______ a extensive b intensive 18 is a local physical property of a system that does not depend on the system size or the amount of material in the system such as temperature, density, and hardness a intensive property b extensive property 19 those that are additive to thesubsystems because they increase or decrease as they grow larger or smaller, respectively, such as mass and volume of the material a extensive property b intensive property 20 foods containing electrolytes except a oils b acids c salts d certain gums e thickeners 21 fundamental property of a material that quantifies how strongly it resists electric current. It is commonly represented by the Greek letter with SI unit of ohm-meter. a electrical resistivity b electrical conductivity c capacitance d permittivity 22 This is the simplest method of measuring resistivity. In this method, voltage drop V across the sample and current through the sample I are measured. a two probe measurements b two probe method c four probe measurement 23 is the most widely used method for resistivity measurements on the low resistive samples. In this method, the potential drop is measured across two probes and distance between these probes D replaces the sample length L a potential probe b Four probe method c four point probe method d two probe method 24 can be used to determine the resistance of the single crystal as well as the bulk specimen also. Here, current passes through the outer contacts which are close to the edges of the sample. a four probe method b four point probe method c potential probe d two probe method 25 has proven to be a convenient tool for the resistivity measurement of small size (of the order of mm) specimen. This method is applicable when the distance between the probes is small compared to the smallest dimension of the sample, and provided none of the probe is too close to an edge of the sample. a four point probe method b two point probe method c Four probe method d potential probe 26 This is the method discussed by vander Pauw to measure resistivity of flat disc (pellet) of arbitrary shape without knowing the current pattern. a Resistivity measurement for a disc of arbitrary shape (Pauw Method) b Resistivity measurement of a pellet using Montgomery Method c Resistivity measurement by using pulse probe method 27 The samples are obtained in powder form, used for pellet study. The pellet should be made by pressing the powder up to a sufficient and known pressure without using any binder a Resistivity measurement of a pellet using Montgomery Method b Resistivity measurement for a disc of arbitrary shape (Pauw Method) c Resistivity measurement of a pellet using Montgomery Method 28 has reported by C.R.B. Lister can also be used to determine the resistivity of some samples by some modifications. In this method, a short pulse of high voltage is applied to the sample and the current or the potential drop across a pair of probes of the sample is measured, usually by means of a fast oscilloscope or other amplifying and recording systems. a Resistivity measurement by using pulse probe method b Resistivity measurement of a pellet using Montgomery Method c Resistivity measurement for a disc of arbitrary shape (Pauw Method)

ELECTRICAL PROPERTIES OF AB MATERIALS

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ELECTRICAL PROPERTIES OF AB MATERIALSVersion en ligne

par Grace Balahay

▪ The extent an object conducts electricity. ▪ Potential for a substance to conduct electricity. ▪ Measure of how easily electrical current can pass through a material.

refers to the amount of energy transmitted through a material or substance.

Conductance expressed in units of

Inverse or reciprocal conductance

Ability of a material to collect and store energy in the form of an electrical charge.

collects energy (voltage) as current flows through an electrical circuit. it is energy-storing devices available in many sizes and shapes

These are defined as a molecular property that is fundamental in all the materials that are capable of impending electron movement resulting in polarization within the material on exposure to an external electric field.

are non-metallic and non-conducting materials which stores electrical charges.

is related to the capacitance of a substance. ▪ It is the ratio of the electric permeability of the material to the electric permeability of free space, such as in a vacuum condition.

is related to energy losses when the food is subjected to an alternating electrical field. ▪ It is a measure of the loss of energy in a dielectric material through conduction, slow polarization currents, and other dissipative phenomena.

Electric and magnetic disturbance traveling through a space at the speed of light. The electromagnetic exhibits a dual wave and particle nature.

excellent absorbers of microwave energy

poor absorbers of microwave energy

utilizes electrical conductance, capacitance, or resistance of grains to measure rapidly the moisture content

electrical conductivity and capacitance _____with water content

electricity is transformed to thermal energy when an alternating current (ac) flows through food.

However, the nature of a material is not the only factor in resistance and conductance, however; it also depends on the size and shape of the material because these properties are ______

is a local physical property of a system that does not depend on the system size or the amount of material in the system such as temperature, density, and hardness

those that are additive to thesubsystems because they increase or decrease as they grow larger or smaller, respectively, such as mass and volume of the material

foods containing electrolytes except

fundamental property of a material that quantifies how strongly it resists electric current. It is commonly represented by the Greek letter with SI unit of ohm-meter.

This is the simplest method of measuring resistivity. In this method, voltage drop V across the sample and current through the sample I are measured.

is the most widely used method for resistivity measurements on the low resistive samples. In this method, the potential drop is measured across two probes and distance between these probes D replaces the sample length L

can be used to determine the resistance of the single crystal as well as the bulk specimen also. Here, current passes through the outer contacts which are close to the edges of the sample.

This is the method discussed by vander Pauw to measure resistivity of flat disc (pellet) of arbitrary shape without knowing the current pattern.

The samples are obtained in powder form, used for pellet study. The pellet should be made by pressing the powder up to a sufficient and known pressure without using any binder