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Sorry for my obvious question, but I am not from the field of electronics and electric engineering.

I was reading this article: The first sentence in the introduction says: " All solid dielectrics exhibit the propensity to accumulate electrical charges under electrical stress beyond an electric field threshold. "

First question, is dielectric polarization the same as saying dielectric accumulate electric charges ?

I would like also to ask about the diadvantages of accumulation of electric charges in dielectrics, can some one give a me a real example from daily life problems?

I read somewhere that this can cause cables to be damaged, how this occurs?

Thank you in advance.

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1 Answer 1

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I think you are mixing concepts such as polarised Capacitor with dielectric. 1) I would recomend you to read WIKI: Dielectric

But basicly dielectric polarization is the distribution of charges in a dielectric material (aislator). Not all aislator materials are dielectric materials. Usually these material are used to reduce the Electric field, like in capacitors.

2) The capacitance on another hand in a capacitor filled with dielectric is explained here: Capacitance

3, 4) A good examples are wires with high tension. If you try to touch it without special protection it can kill you. Also normal wires also have capacitance and it can be different in different conditions. For example in an HDMI cable the signal may lose it's matching and this will make impossible to see correctly the image.

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  • \$\begingroup\$ Thank you for you answer, however I am really confused about the expression " dielectric accumulate electric charges under electric field" what does this mean ? \$\endgroup\$
    – Nizar
    Aug 7, 2017 at 14:11
  • \$\begingroup\$ Ok, I think now I understand you question about accumulate electric acharges. What it means is that without electric field you wont have any charge. Also there is a relationship between the separation and the electric field. This article explains it in more details link. I won't be able to explain it in more details, as it's basicly a whole chapter in a book "physics for engineers and scientists". What it expalins is the relationship between, the dielectric, the structure of capacitor and the behaviour of electric field and charges. \$\endgroup\$
    – Dimitri
    Aug 7, 2017 at 14:16
  • \$\begingroup\$ Thank you again for your time explaing this concept. However I edited my question to make it more precise. \$\endgroup\$
    – Nizar
    Aug 7, 2017 at 14:22
  • \$\begingroup\$ ok. I will check it later and try to answer it all. \$\endgroup\$
    – Dimitri
    Aug 7, 2017 at 15:06

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