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- Question
The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximately
Options- A. 22 mA
- B. 120 mA
- C. 220 mA
- D. 50 mA
- Correct Answer
- 22 mA
- 1. A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
Options- A. 152 mA
- B. 32 mA
- C. 12 mA
- D. 120 mA Discuss
- 2. The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 Ω. The voltage across the load is
Options- A. 0 V
- B. 6 V
- C. 18 V
- D. 2 V Discuss
- 3. A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than
Options- A. 2 µF
- B. 4 µF
- C. 10 µF
- D. 1.5 µF Discuss
- 4. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
Options- A. 1.8 V
- B. 18 V
- C. 7.2 V
- D. 72 V Discuss
- 5. If there is 6 A of current through the filament of a lamp, how many coulombs of charge move through the filament in 1.75 s?
Options- A. 10.5 C
- B. 105 C
- C. 3.4 C
- D. 34 C Discuss
- 6. A phasor represents
Options- A. the magnitude and a quantity direction
- B. the width of a quantity
- C. the phase angle
- D. the magnitude of a quantity Discuss
- 7. The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency
Options- A. must be increased
- B. must be decreased
- C. is held constant
- D. has no effect Discuss
- 8. A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter?
Options- A. 5.14 MHz
- B. 514 kHz
- C. 5.03 MHz
- D. 503 kHz Discuss
- 9. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is
Options- A. 1 A
- B. 7 A
- C. unknown
- D. the larger of the two Discuss
- 10. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is
Options- A. 12.5 Ω
- B. 200 Ω
- C. 20 KΩ
- D. 50 Ω Discuss
More questions
Correct Answer: 120 mA
Correct Answer: 0 V
Correct Answer: 1.5 µF
Correct Answer: 72 V
Correct Answer: 10.5 C
Correct Answer: the magnitude and a quantity direction
Correct Answer: must be decreased
Correct Answer: 5.14 MHz
Correct Answer: 7 A
Correct Answer: 20 KΩ
Explanation:
10/(R/4) = 2 mA
40/R = 2 mA
R = 40/2 mA
= 40/0.002 A
= 20000 kohm (20 kohm)
40/R = 2 mA
R = 40/2 mA
= 40/0.002 A
= 20000 kohm (20 kohm)
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