Synthesis Questions Use available resources to help you answer the following que

Question

Synthesis Questions Use available resources to help you answer the following questions. 1. Suppose you had a parallel circuit with several identieal light bulbs of equal resistance. If one bulb goes bad or is disconnected), what happens to the brightness bulbs? 2. What happens to the brightness of other bulbs if a single bulb goes bad in a series circuit? Explain your answer. 3. The circuit shown here contains three light bulbs: two with identical resistance, and one with twice the resistance as the other bulbs. The circuit is powered by a 10 VDC power supply (assu that the power supply is ideal and has negligible internal me resistance) and controlled by a switch S. When answering the following questions, be sure to show all of your work. 4.00 8.00 4.00 10V 3a. What is the equivalent resistance of the entire circuit? PS-2899A

Explanation / Answer

1. for a parallel circuit of bulbs, if one bulb get fuswed, the other bulbs starts recieveing the additional current that is not going through the fused bulb, so the brightness of each bulb increases
2. FOr a series circuit, the circuit breaks when the bulb goes bad and hence all the bulbs go out the same instant one bulb goes bad
3. Req = 4 + (1/8 + 1/4)^-1 = 4 + 8/3 = 20/3 = 6.66 ohms

V = iReq
i = V/Req = 10*3/20 = 1.5 A

Va = V - iR = 10 - 1.5*4 = 10 - 6 = 4 V

Ia = Va/R = 4/4 = 1 A
Ib = Vb/R = 6/8 A
Ic = Ia - Ib = 2/8 A

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