ES 250 First Midterm Practice Exam 2 1. ai= _________A, bi= ________A, 2i = _________A, and 1v = _________V 2. The current in the 20-Ω resistor is ai = _________A. The voltage across the 10-Ω resistor is bv = _________V. The (independent) voltage source current is ci = _________A. 3. The Ohmmeter measures equivalent resistance. a. To cause eqR= 12 Ω, choose R = _______Ω. b. If R = 14 Ω then eqR = __________Ω. 4. Consider this combination of resistors. Let pRdenote the equivalent resistance. (a) Suppose 40 Ω ≤ R ≤ 400 Ω. Determine the corresponding range of values of pR: _________ Ω ≤ pR ≤ _________ Ω (b) Suppose instead R = 0 (a short circuit). Then pR = _________ Ω (c) Suppose instead R = ∞ (an open circuit). Then pR = _________ Ω (d) Suppose instead the equivalent resistance is pR = 80 Ω. Then R = _________ Ω5. Here’s a single circuit drawn in four parts for convenience. The four parts are connected by the dependent sources. Given that 10.8 A,i = determine the values of 1R , 2v , 3v , and 4i . 1R = ________Ω , 2v = ________V, 3v = ________V and 4i = ________A. 6. Encircled numbers are node numbers. The corresponding node voltages are: 12 312 V, 10.5 V and 6 Vvv v=== The value of the gain of the CCCS is k = ___________ A/A. The resistance of the resistor at the top of the circuit is R = __________Ω. (Round to an integer.) The power supplied by the independent (0.1 A) current source is _________W. 7. Let i1, i2 and i3 denote the mesh currents in meshes 1, 2 and 3, respectively. Determine the values of these mesh currents: i1 = _________A and i2 = ____________A Determine the value of the resistance R: R = _____________