A metallic wire is stretched from original length of 1 m to 5 m. If the original cross-sectional area is 3 square millimeters and original resistance is 9 ohms, determine the new resistance (in ohms) of the metallic wire. Assume the volume of the wire is preserved.

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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.