An operational amplifier, as used in todays consoles, has a calculated gain of 5This means that when the input changes ()
A、A.5 volts, the output changes 10 volts
B、B.10 volts, the output changes 5 volts
C、C.2 volts, the output changes 10 volts
D、D.10 volts, the output changes 2 volts