Connect the oscilloscope, what is the reason of the current increase?
Because the oscilloscope inside is to use the audion to work.
The three electrodes of the triode, when properly connected (the input end is connected to two, the output end is connected to two, and one of the electrodes is repeated), can amplify the input signal (here refers to the current) and be easier to receive.
The inside configuration of the transistor is, to put it simply, the C.B.E electrode.The C electrode (collector) normally collects the current, and when a signal comes from the B electrode (base), it sends the current from the C electrode to the E electrode (emitter), thus achieving the amplification process.
It should be noted that the transistor does not violate the law of conservation of energy.Because the transistor itself needs power to work properly.The energy added by amplifying the current comes from the external power supply.