A closed loop
Explain why a current flows only in a closed loop, from the source back to the source, and what happens when the loop opens.
Exercises
Three levels: the bare notion, the application, the reasoning. Calculations, true-or-false and choices are checked here; for an essay, you read the answer and judge yourself.
9 exercises0 of 9
The bare notion 3 exercises
The application 3 exercises
The reasoning 3 exercises