This activity is designed to be completed with the use of an iPad or device with a QR code reading app. Students watch the videos provided and complete their experiment. This can be used as a station or as a self-directed lesson, enrichment etc. I have personally used this with a combined grade level class. Students used a voltmeter, multiple lemons, pennies or copper pieces, galvinized nails, and wires (alligator clips are useful for this).