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Energy and Power
Comments
Question
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
Correct Answer
neither resistor
Energy and Power problems
Search Results
1. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 30 kW
2. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: shorted
3. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: all of the above
4. Three hundred joules of energy are consumed in 15 s. The power is
Options
A. 2,000 W
B. 2 W
C. 20 W
D. 200 W
Show Answer
Scratch Pad
Discuss
Correct Answer: 20 W
5. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
Options
A. 1.286 kWh
B. 12.85 kWh
C. 535 kWh
D. 252 kWh
Show Answer
Scratch Pad
Discuss
Correct Answer: 1.286 kWh
6. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 2 W
7. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 768 mW
8. In 40 kW, there are
Options
A. 0.4 mW
B. 40,000 W
C. 400 W
D. 5,000 W
Show Answer
Scratch Pad
Discuss
Correct Answer: 40,000 W
9. A half-watt is equal to how many milliwatts?
Options
A. 5,000 mW
B. 5 mW
C. 500 mW
D. 50 mW
Show Answer
Scratch Pad
Discuss
Correct Answer: 500 mW
10. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 2,000 h
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