In a vacuum triode (positive terminal to anode, negative terminal to cathode,) once we apply the positive charge to the control grid it will start to attract free electrons, which are released from cathode due to thermo-ionic emission.
- How do the electrons flow from the control grid to the anode , since both of these terminals are positively charged?
- What is the driving force that helps in moving the electrons from the control-grid to the anode?
- How come placing the control-grid is effective, when there is voltage required to move free electrons from the cathode to the anode? Zero voltage on control grid = voltage required to move free electrons from the cathode to the control grid + voltage required to move electrons from control grid to anode.
Please help me to understand better.