Do you know why it's called a watt? an ohm? a volt? Your students will know after this thorough history. From amber and fur (600 B.C.) to jumping frogs (1786) to electrical resistance (1827), this unit is a fantastic introduction to the history of electricity.
A two page explanation of the scientific method with multiple choice and short answer questions and a writing prompt. abcteach The Scientific Method Vocabulary Set 2 may be useful with this reading comprehension.