The first task today shows students how motors generate power. If students are older, you can give them more information about electricity and current. In the general case, however, it is enough to say that the faster the motor rotates, the more power it generates. This can be seen from the current power option of the wait and switch blocks. You can show students this option or leave them search for it in lesson 1.
The next task is to download a block and insert it in a program. This block reads the power from port A and transmits it to port D. The aim of the exercise is to highlight the difference between wheels. As T-Rex has larger wheels, it moves faster.
The following two tasks show that even when the wheels of the robot are larger, a lot of power is lost when the two motors are connected directly. You can explain that this is the principle due to which an eternal engine cannot be built.