This week's 52 Weeks of GUST project is quite practical -- it's great for holidays and special occasions. Next time, instead of going out to the store to buy a greeting card, make these super special LED greeting cards to light up a room!
What's Going On?
You've just created a circuit! A circuit is simply a path through electrical current flows. In order for a circuit to work, the path must be complete. That means that there cannot be any holes or gaps throughout the path. In this case, the copper tape makes up much of the path. When the folded corner of the card with one end of the tape touches the battery, the circuit is closed and the light can successfully turn on. However, if this path is broken, such as when the corner is unfolded, the circuit is no longer complete and the light turns off!