Discussion
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- Question
When the current through a 12 kΩ resistor is 8 mA, the power is
Options- A. 7.68 mW
- B. 768 mW
- C. 7.68 W
- D. 76.8 W
- Correct Answer
- 768 mW
- 1. The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
Options- A. 2 W
- B. 1 W
- C. 5 W
- D. 0.5 W Discuss
- 2. A 33 Ω half-watt resistor and a 330 Ω half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
Options- A. 33 Ω
- B. 330 Ω
- C. both resistors
- D. neither resistor Discuss
- 3. If it takes 400 ms to use 12,000 J of energy, the power is
Options- A. 30 kW
- B. 30 W
- C. 3 W
- D. 300 kW Discuss
- 4. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
Options- A. overheated
- B. shorted
- C. open
- D. reversed Discuss
- 5. For 12 V and 40 mA, the power is
Options- A. 480 mW
- B. 0.480 W
- C. 480,000 µW
- D. all of the above Discuss
- 6. In 40 kW, there are
Options- A. 0.4 mW
- B. 40,000 W
- C. 400 W
- D. 5,000 W Discuss
- 7. A half-watt is equal to how many milliwatts?
Options- A. 5,000 mW
- B. 5 mW
- C. 500 mW
- D. 50 mW Discuss
- 8. A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
Options- A. 1 h
- B. 200 h
- C. 2,000 h
- D. 10 h Discuss
- 9. A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?
Options- A. 20.16 kWh
- B. 201.6 kWh
- C. 2.01 kWh
- D. 8.4 kWh Discuss
- 10. How much continuous current can be drawn from a 60 Ah battery for 14 h?
Options- A. 42.8 A
- B. 428 A
- C. 4.28 A
- D. 4.2 A Discuss
Energy and Power problems
Search Results
Correct Answer: 2 W
Correct Answer: neither resistor
Correct Answer: 30 kW
Correct Answer: shorted
Correct Answer: all of the above
Correct Answer: 40,000 W
Correct Answer: 500 mW
Correct Answer: 2,000 h
Correct Answer: 201.6 kWh
Correct Answer: 4.28 A
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