How to Make a Galvanometer

A galvanometer is an instrument designed to detect electric currents. You can make one with a few simple materials.


  1. 1
    Buy the necessary materials, listed below.
  2. 2
    Place the compass in the center of a small cardboard box. This step is optional.
  3. 3
    Scrape off about a half inch of insulation (1.25 cm) from each end of the bell wire you use.
  4. 4
    Starting about 6 inches (15 cm) from one end circle and wind the wire tightly around the box or the compass and circle it about a dozen of times.
  5. 5
    Leave another 6 inches of wire free on the other side of the box or compass.
  6. 6
    Rest your galvanometer on the table and make sure that it is horizontal.
  7. 7
    Turn it until the needle of the compass is parallel to the coil of wire.
  8. Image titled Compass_galvanometer
    Connect the ends of the bell wire to a battery or a cell.
    Image titled Galvanometer

Things You'll Need

  • A compass
  • Fifteen feet or 4.5 m of bell wire
  • A small rectangular cardboard box (optional)

Article Info

Categories: Science | Electrical Maintenance | Computers and Electronics