week 5 lab – DC motors

This week I was only able to get through one lab, since we were actively working on the midterm. I successfully powered-up a DC motor using a 9V power supply and controlled it with a potentiometer. Here is the set up:

set up for a DC motor controlled by a potentiometer

The video shows the variable speed of the motor: 

 ! remaining questions!

Most of my questions from this week are about diodes:

  • What do the numbers on the diode mean and what is the difference between  different diodes?
  • How to we know the direction of the diode and which way should it be pointing when connected to collector and emitter?
  • Which was does the electricity flow, or more specifically, how does the diode prevent the wrong flow of electricity?

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