The first true battery was built in 1800 by the Italian scientist Alessandro Volta. He sta thin lay of zi and cop, separated b pieces o cloth soa in sa water. H pile prod a steady flow of electricity for the first time. Before Volta's invention, scientists could only produce brief sparks of static electricity. The unit used to measure electric force, the volt, is named in his honor. Today, batteries power everything from phones to cars.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.