How do the transistors amplify?is it violating law of conservation of energy?what is use of bias?
The trick is that an amplifier does not amplify at all. I mean it does not make one signal stronger. Rather it uses that signal to open and close a sort of valve – the English used to call vacuum tubes ‘valves’ – a transistor or a very complex network of all sorts of components – that regulates thee flow of a, well, a sort of larger pipe or signal, a signal capable of more power. You could imagine a hand held sprayer on the end of a garden hose. If you imagine a very sensitive ‘trigger’ on the valve of the garden sprayer, and you held it correctly, you could imagine that a single drop of water from a few inches up could cause the valve to open, at least part way and for a brief time. That would result in a great gush of water from the sprayer. That gush is the ‘amplified’ drop of water. So there is no violation of conservation of energy. the energy of the stronger signal comes from a ‘stronger’ electrical source, one capable of producing more current. Transistors have a sort of ‘gate’
