The collector voltage is measured relative to zero, so the statement ' the collector voltage falls' means that the voltage of the collector drops towards zero.
This must increase the voltage across the collector load resistor which is connected between V+ (the voltage rail) and the collector.
By ohms law this increases the current in this resistor. This current also flows through the transistor.
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Aaron Carman