Neurons are burned by the thousands when students all around the world are starting to learn physics and all its formulas and laws. Understanding it is crucial to handle with electricity, either for creating a complex system of fuses or just light up a simple bulb. Leave the pencil and notebooks aside, they will be not necessary, only your logic thinking and a few tries will be enough to make many different electronics work with simple connections. It's important to link them, completely without energy, to the sources with the correct combination, otherwise nothing will happen and you will be reproved in the test. Bulbs, radio and common stuff you have in your house will need more than connecting the power and plugging them, making you study for your next exams without needing to give up on fun and a true challenge, common sensations when you are playing on the computer.