单项选择题
An operational amplifier, as used in todays consoles, may have a calculated gain of 5√This means that as the input changes by （）
A.1 volt, the output changes 5 volts
B.5 volts, the output changes 1 volt
C.5 volts, the output changes 10 volts
D.10 volts, the output changes 5 volts
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相关考题
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单项选择题
Why is it desirable to operate paralleled AC generators at the same power factor?（）
A.Circulating currents are kept to a minimum
B.Field excitation losses are kept to a minimum
C.Generator rotors will have a lesser tendency to hunt
D.Because a power factor increase will decrease kilowatt output -
单项选择题
An ammeter should be used to measure （）
A.the voltage between two points in a circuit
B.circuit continuity
C.current flow in a circuit
D.total or partial circuit resistance -
单项选择题
When the voltage remains constant and the resistance is increased in a series circuit, the flow of current （）
A.increases by the square of the original value
B.increases
C.remains the same
D.decreases
