Hand-Crank Generator Lights an LED
Light brightness changes with cranking.
Teaching & key ideas
What you do: Crank slowly, then faster; reverse direction if setup permits.
What students see: Light brightness changes with cranking.
Why it works: Mechanical energy becomes electrical energy through electromagnetic induction.
Question to ask: Where does the electrical energy come from?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Where does the electrical energy come from?