9. Cap Precharged charge On the capacitor shown in the circuit there is an initial charge, which delivers Uc = 10V before closing the switch. The other values are I = C = 2.2µF 4mA, R₁ = 6.8kn, R₂ = 1.5kn, I R1 R2 t=0 C || a) Calculate the current ic and the voltage uc over time, if the switch closed at t = 0. (It is open previously.) b) Draw a sketch giving both values over time and mark the calculated values for time constant and significant values.

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Dielectric Breakdown

A dielectric is a material with low electrical conductivity and so is classified as an insulator. Dielectric materials are used to block the flow of electricity through them, allowing them to behave as an insulators. They can also be used to store electric charge or improve capacitance.Dielectrics have no free electrons for conduction because electrons are tightly bound to the nucleus. Because dielectrics contain a small number of electrons for electrical conductivity, they have a dipole. The two primary roles of dielectrics in electrical devices are insulation and electrical energy storage. An electric field polarizes the dielectric, and the polarization of the molecules allows dielectric materials to store charge.