The mosfet isn't "better", they just work differently. All you need to turn on the mosfet is a voltage applied to the gate, that's why I touching it with your finger makes it come on all the way. For the BJT, the amount of current it sends to the LED is proportional to how much current you put into the base, touching it with your finger is a very high resistance path and sends a very low amount of current, that's why the led doesn't come on very brightly
The voltage will sit on the gate and VERY slowly drain off, while on a BJT, it will drain immediately. Also, the current that passes from the collector to emitter is proportional to the current passing through the base, it's a current multiplier, while on a mosfet, the current is based on the voltage sitting on the gate, and will not drain off on it's own(ideally, it actually drains off very very slowly). That means the voltage out isn't a linear correlation to the voltage on the gate, which may be more difficult to design for. If using an op amp to voltage follow, and you use global feedback, using a power transistor OR a mosfet will both work fine. In fact, a mosfet may work even better as the op amp probably doesn't need to swing as far and doesn't need to produce as much current to drive the output to the desired voltage. You may need to bridge gate and drain with a high value resistor though.
Main use of transistor is for amplifying while MOSFET is for switching. As you have seen, once the mosfet is on, current flows from source to drain while for the transistor, the base current is proportional to the collector current. That person serves as a very large resistance to the base therefore very low current also at the collector resulting to very dim light. Transistor can be used to amplify analog signals which is very low in value .
Can someone clarify, im trying to learn electronics and i thought that mosfets behaved like bjts in the sense that the current is haulted when the voltage is taken away. Why is it that this one is staying on? I was under the impression that scrs worked like that?
Amigo muy bueno tus videos. Como puedo saber que resistencia o que medida de resistencia lleva un mosfet, siempre me hise esa pregunata, si lleva alguna medida especial o como se calcula una resistencia para sierto transistor?
So u are saying is that when a +ve is connected to base of a BJT it turns ON as long as there is that voltage and for MOSFET when a -ve is given to gate it remains ON until another pulse is given ?
I'm using same material for transistor in magnetic induction experiment but my transistor is over heating leading to bulb not glowing any idea how I can prevent that?
mosfet need minus base to off when mosfet get plus volt , to get on , transistor is like only switch when we pass base current it is on and it is stop when no base here
The 2 of them are transistors and. Another things is that leds with differents colors have differents potentials to turn on so u have to use the same kind of led for the proof
давайте сравнивать ещё яблоки и груши. кстати в процессорах трудятся биполярные транзисторы мосфеты слишком медленные, огромные ёмкости заебешься перезаряжать
