Triode, That's Right.

To understand the amplification effect of triode, remember one thing: energy will not be generated for no reason, so triode will not generate energy.But the power of triode is that it can control large current through small currentThe principle of amplification is to control large static DC through small AC input.

Suppose the triode is a dam. The strange thing about the dam is that there are two valves, a large valve and a small valve. Small valves can be opened manually. Large valves are heavy and cannot be opened manually. They can only be opened through the hydraulic power of small valves.Therefore, the normal workflow is that whenever water is discharged, people open the small valve, and a small flow trickles out. This trickle impacts the switch of the large valve, and the large valve opens, and the turbulent river flows down.If you keep changing the opening size of the small valve, the large valve will change accordingly. If you can change it strictly in proportion, the perfect control will be completed.

If one day, the weather is very dry and the river water is gone, that is, the big water flow is empty. The administrator opened the small valve at this time. Although the small valve still impacted the large valve and opened it as usual, there was no water flow because there was no water flow. This is the cut-off region in the triode.The saturation zone is the same, because the river water has reached a great extent at this time, and the size of the valve opened by the administrator is useless. If you don't open the valve, the river will rush away by itself, which is the breakdown of the diode.In the analog circuit, the general valve is half open, and the output water flow is determined by controlling its opening size. When there is no signal, the water will flow, so there will be power consumption when it does not work.

In the digital circuit, the valve is open or closed. When not working, the valve is completely closed without power consumption.