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A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?
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P = 75 + 25 = 100 W., Total.
P = 120 * I = 100
I = 100/120 = 0.833A
R = E/I = 120/0.83333 = 144 Ohms.
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