5555555555 16. A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of RUNK is ________. (a) 680 Ω (b) 1,029 Ω (c) 200 Ω (d) 880 Ω
5555555555 9. A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is ________. (a) Z = 47 Ω + j150 Ω (b) Z = 47 Ω – j150 Ω (c) Z = 197 Ω (d) Z = 103 Ω
5555555555 25. A 120 V voltage source has a source resistance, RS, of 60 Ω. The equivalent current source is ________. (a) 2 A (b) 4 A (c) 200 mA (d) 400 mA
5555555555 7. The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately ________. (a) 112 Ω (b) 11.2 Ω (c) 1.2 Ω (d) 18 Ω
5555555555 20. What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA? (a) 8.2 kΩ (b) 820 Ω (c) 8.2 Ω (d) 82 Ω