“dielectric”的概念、定义、翻译、参考文献-科学参考

dielectric

Physics

A nonconductor of electric charge in which an applied electric field causes a displacement of charge but not a flow of charge. Electrons within the atoms of a dielectric are, on average, displaced by an applied field with respect to the nucleus, giving rise to a dipole that has an electric moment in the direction of the field. The resulting stress within the dielectric is known as the electric polarization (P) and is defined by P=D−Eε‎₀, where D is the displacement, E is the electric field strength, and ε‎₀ is the electric constant.

The dielectric constant is now called the relative permittivity. The dielectric strength is the maximum potential gradient that can be applied to a material without causing it to break down. It is usually expressed in volts per millimetre. See also capacitor.

Electronics and Electrical Engineering

A solid, liquid, or gaseous material that can sustain an electric field and act as an insulator. A perfect dielectric is one in which no energy is lost from an electric field applied across the dielectric. An imperfect dielectric is one in which electric hystereis losses occur. The displacement, D, lags behind the applied field, E, resulting in a typical hysteresis curve (see magnetic hysteresis) and in energy losses from the applied field, which appear in the form of heat.

Geology and Earth Sciences

A material which does not conduct electricity, but in which an applied electric field displaces charge rather than causing it to flow.

单词	dielectric
释义	dielectric Physics A nonconductor of electric charge in which an applied electric field causes a displacement of charge but not a flow of charge. Electrons within the atoms of a dielectric are, on average, displaced by an applied field with respect to the nucleus, giving rise to a dipole that has an electric moment in the direction of the field. The resulting stress within the dielectric is known as the electric polarization (P) and is defined by P=D−Eε‎₀, where D is the displacement, E is the electric field strength, and ε‎₀ is the electric constant. The dielectric constant is now called the relative permittivity. The dielectric strength is the maximum potential gradient that can be applied to a material without causing it to break down. It is usually expressed in volts per millimetre. See also capacitor. Electronics and Electrical Engineering A solid, liquid, or gaseous material that can sustain an electric field and act as an insulator. A perfect dielectric is one in which no energy is lost from an electric field applied across the dielectric. An imperfect dielectric is one in which electric hystereis losses occur. The displacement, D, lags behind the applied field, E, resulting in a typical hysteresis curve (see magnetic hysteresis) and in energy losses from the applied field, which appear in the form of heat. Geology and Earth Sciences A material which does not conduct electricity, but in which an applied electric field displaces charge rather than causing it to flow.
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