Most of the electricity you use every day is made from heat energy, wind power, or other sources. But it’d be great if we could make electricity from the light of the sun, which is always peeking its face out from the sky. In fact, there’s a device that can make electricity from sunlight. It’s called a solar cell.

There’s an amazing part inside a solar cell. When sunlight hits this part, it separates the electricity it makes between a part that gathers positive electric charges and a part that gathers negative electric charges. People were able to invent this amazing part, because electricity flows when negative electric charges are drawn toward positive electric charges.