1. A sinusoidal alternating voltage has an RMS value of 440 V and a frequency of 50 hz. It crosses the zero axis in a positive direction when t-0. Determine a) the time before passing through its negative maximum reaches the value of 225 V, b) the time to reach a value of 300 V before coming to a period. 2. Given the four instantaneous current: e:=-15 cos (346t-2), es= 12.5 sin (346t+3m/4), es= -10 sin (346t-/12) and e-18 cos (346t5n/8). Determine the resultant voltage using wave and vector solution. 3 Three circuits A, B and C are connected in series across 350 V supply. The voltage across circuit A is 80 V lagging the supply voltage by 33° and the voltage across circuit C is 140 V leading the supply voltage by 48° Determine the voltage across circuit B and its phase displacement from the supply voltage using wave and vector solution. CS Scanned with CamScanner

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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.