Figure Q20 shows a DC Wheatstone bridge fed by supply voltage of 240V. The values of arm resistances connected in the bridge are R1 = 2000, R2 = 200 and R3 = 700. Then, the unknown value of R4 is calculated as, R. (Ve-Va) Figure Q20 O a. 17 ohms O b. 27 ohms O c7 ohms O d. 37 ohms

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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.