QUESTION 5 wire-wound resistor is made from a 250 cm length of copper wire having a circular cross-section of radius 0.5 mm. Given that the wire has a resistivity of 0.018 UQm, calculate its resistance value (k Q QUESTION 6 A resistor of 680 K Q. when connected in a circuit, dissipates a power of 85 mW. Calculate the current flowing through it

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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.