If the input voltage amplitude ( at the grid ) changes from-1.5 V to-0.5 V ( difference of 1 V ), the anode current will change from 1.2 to 3.3 mA ( see image ).
22.
Anode current does not cease but reverses its polarity ( i . e . the direction of its flow ) and stored charge " Q s " starts to flow out of the device at an almost constant rate " "'I R " " '.
