For the circuit shown in Fig.4, calculate the current in resistance R4. Use Thevenin's theorem. Values are as follows: V1 = 20V, V2 = 12V, R1 = 5 ohm, R2 = 2 ohm, R3 = 8 ohm and R4 = 10 ohm. Internal resistances of the batteries are zero. R3 V2 R1 R2 R4 V1 Fig.4

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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.