![Using the linked LED circuit, do transistors (BJT, MOSFET, etc) really amplify currents/voltages, or do they just create a closed circuit which has an external voltage supply? - Quora Using the linked LED circuit, do transistors (BJT, MOSFET, etc) really amplify currents/voltages, or do they just create a closed circuit which has an external voltage supply? - Quora](https://qph.cf2.quoracdn.net/main-qimg-f4767687ffdec88c4a7b045e57889ef7.webp)
Using the linked LED circuit, do transistors (BJT, MOSFET, etc) really amplify currents/voltages, or do they just create a closed circuit which has an external voltage supply? - Quora
![When switching an LED with a transistor via a microcontroller, do I have to worry if the load supply voltage is higher than my microcontroller logic? - Electrical Engineering Stack Exchange When switching an LED with a transistor via a microcontroller, do I have to worry if the load supply voltage is higher than my microcontroller logic? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/mYnGp.png)
When switching an LED with a transistor via a microcontroller, do I have to worry if the load supply voltage is higher than my microcontroller logic? - Electrical Engineering Stack Exchange
![What happened to the voltage measurement across the collector and emitter pins of the transistor when the LED transitioned from ON to OFF? What does this tell us about the state of What happened to the voltage measurement across the collector and emitter pins of the transistor when the LED transitioned from ON to OFF? What does this tell us about the state of](https://homework.study.com/cimages/multimages/16/62328178048550982593690978.png)