Discussion
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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. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?
Options- A. 4 Ω
- B. 400 Ω
- C. 4 kΩ
- D. 4.4 Ω Discuss
- 2. How much resistance is needed to draw 17.6 mA from a 12 volt source?
Options- A. 212 Ω
- B. 6.8 kΩ
- C. 68 Ω
- D. 680 Ω Discuss
- 3. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?
Options- A. 3.3 kΩ
- B. 33 kΩ
- C. 2.2 kΩ
- D. 22 kΩ Discuss
- 4. Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 kΩ of resistance?
Options- A. 27.2 mA
- B. 59 mA
- C. 5.9 mA
- D. 590 mA Discuss
- 5. How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?
Options- A. 50 V
- B. 500 V
- C. 80 V
- D. 8 V Discuss
- 6. 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?
Options- A. 183 Ω
- B. 18.3 Ω
- C. 66 Ω
- D. 6.6 Ω Discuss
- 7. How much current is produced by a voltage of 18 kV across a 15 kΩ resistance?
Options- A. 1.2 A
- B. 12 A
- C. 120 mA
- D. 12 mA Discuss
- 8. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is
Options- A. 220 kΩ
- B. 22 kΩ
- C. 2.2 kΩ
- D. 220 Ω Discuss
- 9. A resistance of 3.3 MΩ is connected across a 500 V source. The resulting current is approximately
Options- A. 15.1 µA
- B. 151 µA
- C. 66 mA
- D. 660 mA Discuss
- 10. If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
Options- A. 8 V
- B. 320 V
- C. 3.2 V
- D. 32 V Discuss
Ohm's Law problems
Search Results
Correct Answer: 4 kΩ
Correct Answer: 680 Ω
Correct Answer: 3.3 kΩ
Correct Answer: 5.9 mA
Correct Answer: 500 V
Correct Answer: 183 Ω
Correct Answer: 1.2 A
Correct Answer: 2.2 kΩ
Correct Answer: 151 µA
Correct Answer: 32 V
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