26.15 • In the circuit of Fig. E26.15. each resistor represents a light bulb. Let R1 = R2 = R3 = R4 = 4.50 N and Ɛ = 9.00 V. (a) Find the current in each bulb. (b) Find the power dissipated in each bulb. Which bulb or bulbs glow the brightest= (c) Bulb R4 is now removed from the cir- cuit, leaving a break in the wire at its posi- tion. Now what is the current in each of the remaining bulbs R1, R2, and R3? (d) With bulb R4 removed, what is the power dissi- pated in each of the remaining bulbs? (e) Which light bulb(s) glow brighter as a result of removing R4? Which bulb(s) glow less brightly? Discuss why there are differ- ent effects on different bulbs.

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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.