16. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
(a) 9.7 Ω
(b) 97 Ω
(c) 23 Ω
(d) 230 Ω
17. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
(a) 40 Ω
(b) 4 Ω
(c) 2 Ω
(d) 20 Ω
18. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
(a) 4 Ω
(b) 400 Ω
(c) 4 kΩ
(d) 4.4 Ω
19. What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing?
(a) 183 Ω
(b) 18.3 Ω
(c) 66 Ω
(d) 6.6 Ω
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
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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