Up next in How to Do Fun Tech & Science Projects (52 videos)
School science fair coming up? Don't worry: We've got step-by-step instructions to dozens of science projects in this Howcast video series, including how to build an erupting volcano, how to make glow-in-the-dark art, how to make a weather barometer, how to make disappearing ink, how to make 3-D glasses, and how to make a marshmallow gun.
You Will Need
- Two potatoes
- A marker
- Two pieces of heavy copper wire
- Two galvanized nails
- Three alligator clips with wires
- A low-voltage, battery-operated calculator
Label your potatoes one and two.
Remove the batteries from the calculator. Take care to note where the positive and negative terminals are within the battery compartment.
Insert a nail into each potato and stick a copper wire into each potato, opposite the nail.
Connect one alligator clip to the copper wire in potato no. 1 and attach the other end to the positive battery terminal in the calculator's compartment.
Create second connection
Clip a second alligator clip to the nail in potato no. 2, and then connect the other end to the calculator's negative battery connection.
Complete the circuit by clipping the third alligator clip to the nail in potato one and to the copper wire in potato two. Voila, a working calculator!