Solution Chapter 3.pdf

# C which resistor in the circuit absorbs the most

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b) How much current (in milliamperes) does the dc source supply? c) Which resistor in the circuit absorbs the most power? How much power does it absorb? d) Which resistor absorbs the least power? How much power does it absorb?

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18) a) Find the equivalent resistance R ab in the circuit in Fig.(18) by using a Y-to- Δ transformation involving resistors R 2 , R 3 and R 5 . b) Repeat (a) using a Δ -to-Y transformation involving resistors R 3 , R 4 and R 5 , c) Give two additional Δ -to-Y or Y-to- Δ transformations that could be used to find R ab . Fig.(17) Fig.(18)

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19) Resistor networks are sometimes used as volumecontrol circuits. In this application, they are referred to as resistance attenuators or pads. A typical fixed-attenuator pad is shown in Fig.(19). In designing an attenuation pad, the circuit designer will select the values of R 1 and R 2 so that the ratio of v o /v 1 and the resistance seen by the input voltage source R ab both have a specified value. a) Show that if , R ab = R L , then R 2 L = 4R 1 (R 1 + R 2 ), and v o / v i = R 2 /(2R 1 + R 2 + R L ), b) Select the values of R 1 and R 2 so that R ab = R L = 300 Ω and v o /v i = 0.5. c) Choose values from Appendix H that are closest to R 1 and R 2 from part (b). Calculate the percent error in the resulting values for R ab and v o if these new resistor values are used.