As a design engineer, you are asked to design a lighting system consisting of a 70-W power supply and two light bulbs as shown in the following figure. You must select the two bulbs from the following three available bulbs.   R1 = 80 Ω, cost = $0.60 (standard size) R2 = 90 Ω, cost = $0.90 (standard size) R3 = 100 Ω, cost = $0.75 (non-standard size)   The system should be designed for minimum cost such that the current drawn from the power supply lies within the range I = 1.2 A ± 10 percent

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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.