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20. A certain Wheatstone bridge has the following resistor values: R1 = 10 kΩ, R2 = 720 Ω , and R4 = 2.4 kΩ. The unknown resistance is ________.
(a) 24 Ω
(b) 2.4 Ω
(c) 300 Ω
(d) 3,000 Ω
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- 5555555555 1. Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is ________. (a) 138 Ω (b) 1,389 Ω (c) 5,700 Ω (d) 880 Ω
- 5555555555 9. Two 3.3 kΩ resistors are in series and this series combination is in parallel with a 4.7 kΩ resistor. The voltage across one of the 3.3 kΩ resistors is 12 V. The voltage across the 4.7 kΩ resistor is ________. (a) 24 V (b) 12 V (c) 0 V (d) 6 V