In order to connect a small "6V 3W" light bulb to a 24 V power supply and light normally, it is necessary to connect a series of resistors, the rated power of the resistor at least, and the total power of the whole circuit

R lamp = u * U / P = 6 * 6 / 3 = 12
R = 36 If r lamp / (r Lamp + R) = 6 / 24
I = 24 / (r Lamp + R) = 24 / 48 = 0.5 A
Pr=I*I*R=0.5*0.5*36=9 W
Ptotal = UI = 24 * 0.5 = 12 W

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