Question

define dielectric strength

Answer 1

The maximum electric field that a pure material can withstand under idealconditions without breaking down (i.e., without experiencing failure of its insulating properties).The theoretical dielectric strength of a material is an intrinsic property of the bulk material and is independent of the configuration of the material or the electrodes with whichthe field is applied. This "intrinsic dielectric strength" corresponds to what would be measured using pure materials under ideal laboratoryconditions. At breakdown, the electric field frees bound electrons. If the applied electric field is sufficiently high, free electrons frombackground radiation may become accelerated to velocities that can liberate additional electrons during collisions with neutralatoms or molecules in a process called avalanche breakdown. Breakdown occurs quite abruptly (typically in nanoseconds ), resulting in the formation of an electrically conductive path and disruptive disharge through the material. For solid materials, a breakdown event severely degrades, or even destroys, its insulating capability.

Answer 2

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