Series Parallel Circuits – Exercise – 1

16. A balanced Wheatstone bridge consists of an R_V of 3,500 Ω, an R₂ of 200 Ω, and an R₃ of 680 Ω. The value of R_UNK is ________.

(a) 680 Ω
(b) 1,029 Ω
(c) 200 Ω
(d) 880 Ω

17. The internal resistance of a 30,000 ohm/volt voltmeter set on its 50 V range is ________.

(a) 15,000 Ω
(b) 150,000 Ω
(c) 1,500,000 Ω
(d) 15,000,000 Ω

18. On which of the following voltage range settings will a voltmeter present the minimum load on a circuit?

(a) 1 V
(b) 50 V
(c) 500 V
(d) 1,000 V

19. The parallel combination of a 470 Ω resistor and a 1.5 kΩ resistor is in series with the parallel combination of five 1 kΩ resistors. The source voltage is 50 V. The percentage of the load current through any single 1 kΩ resistor is ________.

(a) 25%
(b) 20%
(c) 100%
(d) 50%

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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