The heating element in an oven has a resistance of R =32 ohms. One of the wires connecting the oven to the 220 volt power source is loose, contributing an additional r = 5 ohms to the closed-loop circuit. What is the power Poven radiated in the oven, and what is the rate Pcontact at which heat is dissipated at the loose contact? The looser is the connection, the greater is the resistance r: What value of r is most likely to cause a fire. Also a graph showing Pcontact versus r

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Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.