题目内容
（请给出正确答案）
A、collector supply voltage
B、collector current times collector resistor
C、0.3 Volts
D、emitter voltage
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更多“When a BJT is in cutoff, the collector-to-emitter voltage is typically equal to _____”相关的问题
A、ac β
B、dc β
C、ac α
D、dc α
If a heavy reliance on fossil fuels makes a country a climate ogre, then Denmark — with its thousands of wind turbines sprinkled on the coastlines and at sea — is living a happy fairy tale.
Viewed from the United States or Asia, Denmark is an environmental role model. The country is "what a global warming solution looks like," wrote Frances Beinecke, the president of the Natural Resources Defense Council, in a letter to the group last autumn. About one-fifth of the country&39;s electricity comes from wind, which wind experts say is the highest proportion of any country.
But a closer look shows that Denmark is a far cry from a clean-energy paradise.
The building of wind turbines has virtually ground to a halt since subsidies were cut back. Meanwhile, compared with others in the European Union, Danes remain above-average emitters of the greenhouse gas carbon dioxide. For all its wind turbines, a large proportion of the rest of Denmark&39;s power is generated by plants that burn imported coal.
The Danish experience shows how difficult it can be for countries grown rich on fossil fuels to switch to renewable energy sources like wind power. Among the hurdles are fluctuating political priorities, the high cost of putting new turbines offshore, concern about public acceptance of large wind turbines and the volatility of the wind itself.
"Europe has really led the way," said Alex Klein, a senior analyst with Emerging Energy Research, a consulting firm with offices in Cambridge, Massachusetts.
Some parts of western Denmark derive 100 percent of their peak needs from wind if the breeze is up. Germany and Spain generate more power in absolute terms, but in those countries wind still accounts for a far smaller proportion of the electricity generated. The average for all 27 European Union countries is 3 percent.
But the Germans and the Spanish are catching up as Denmark slows down. Of the thousands of megawatts of wind power added last year around the world, only 8 megawatts were installed in Denmark.
If higher subsidies had been maintained, he said, Denmark could now be generating close to one-third — rather than one-fifth — of its electricity from windmills.
A、midpoint bias
B、midpoint movement
C、output movement
D、Q-point movement
A、base voltage
B、emitter resistor
C、collector resistor
D、All of the above
A、inversely related to the emitter resistor
B、inversely related to β
C、directly related to the collector resistor
D、directly related to the emitter resistor
A、voltage and current
B、the β and the junction temperature
C、age and amount of use
D、None of the above
A、collector supply voltage and the total resistance in the collector and emitter circuits
B、collector-to-emitter and collector supply voltage
C、collector supply, collector-to-emitter voltage, and the total collector circuit resistance
D、the transistor
A、a 180° phase shift
B、an output voltage slightly greater than the input voltage
C、the emitter connected to dc ground potential
D、None of the above
A、collector resistor is usually unknown
B、emitter resistor is usually unknown
C、relative voltage levels have not been defined
D、All of the above
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