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- Question
You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
Options- A. 9 V
- B. 900 mV
- C. 0 V
- D. 18 V
- Correct Answer
- 9 V
- 1. In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is
Options- A. 3 A
- B. 6 A
- C. 9 A
- D. 27 A Discuss
- 2. In 0.025 W, there are
Options- A. 25 kW
- B. 0.00025 mW
- C. 2,500 µW
- D. 25 mW Discuss
- 3. Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.
Options- A. single-phase 32 A; three-phase 16 A
- B. single-phase 16 A; three-phase 8 A
- C. single-phase 8 A; three-phase 4 A
- D. single-phase 16 A; three-phase 0 A Discuss
- 4. The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current is
Options- A. 220 Ω
- B. 470 Ω
- C. 560 Ω
- D. impossible to determine without knowing the voltage Discuss
- 5. A neutral atom with an atomic number of five has how many electrons?
Options- A. 1
- B. 5
- C. none
- D. depends on the type of atom Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
More questions
Correct Answer: 9 A
Correct Answer: 25 mW
Correct Answer: single-phase 16 A; three-phase 8 A
Correct Answer: 560 Ω
Correct Answer: 5
Correct Answer: 120 mA
Correct Answer: 0 V
Correct Answer: 1.5 µF
Correct Answer: 72 V
Correct Answer: 10.5 C
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