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Energy and Power
Energy and Power
A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is
42.85%
85.7%
4.28%
8.57%
42.85%
85.7%
4.28%
8.57%
Answer
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Energy and Power
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?
201.6 kWh
20.16 kWh
2.01 kWh
8.4 kWh
201.6 kWh
20.16 kWh
2.01 kWh
8.4 kWh
Answer
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Energy and Power
In 0.025 W, there are
25 mW
25 kW
2,500 µW
0.00025 mW
25 mW
25 kW
2,500 µW
0.00025 mW
Answer
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Energy and Power
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
open
overheated
reversed
shorted
open
overheated
reversed
shorted
Answer
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Energy and Power
A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat?
33
both resistors
neither resistor
330
33
both resistors
neither resistor
330
Answer
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