Question

why is the resistance associated with V(in) is what it is? Shouldn't it just be 3R?

6 of 38 ECSE-200 Quiz #3 (27 Jan 2012) McGill ID# READ eoch question and its parts carefully before starting. SHOW ALL YOUR WORK Give units on your answers (where oppropriate) 1. Consider the circuit diagram below, including the Y-to-d equivalent resistance transformation The boxed area is known as a "fixed attenuator pad", and is used in volume control circuits. Answer the questions 3R pod 3R BR a) If R.-R, what is the equivalent resistance between the terminals A and 3712pts HINT: You may find it useful to use a Y-to-4 equivalent resistance transformation. b) If R R, what is the ratio oe/ve? Your answer should be a number. 12pts c) If R R 6000, and v 2V, how much power is absorbed by the resistor R? 12pts d) If R R 6000, and v 2V, how much power is absorbed by the entire circuit of resistors? 2pts .3民 3R.R 3月 民 page 1/4

Answer 1

from the figure it is clear that

R amd 3R are in parallel so 1/R' = (1/R) + (1/3R)

R' = 4R/3

one more to the right, again 3R and R are paralle

here toward Vin, 3R is connected to R so

as they are in parallel, V would be same in across R and 3R