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

5555555555 18. The following resistors (one each) are connected in a series circuit: 470 Ω, 680 Ω, 1 kΩ, and 1.2 kΩ. The voltage source is 20 V. Current through the 680 Ω resistor is approximately ________. (a) 60 mA (b) 30 mA (c) 6 mA (d) 300 mA

5555555555 15. A 680 Ω load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, Rs, is 12 kΩ. The load current, RL, is ________. (a) 0 A (b) 1.2 A (c) 114 mA (d) 1.14 A

5555555555 10. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is ________. (a) 220 kΩ (b) 22 kΩ (c) 2.2 kΩ (d) 220 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