Materials You Will Need:

• Energizer_® Power Pack
• Compass
• Strip of 3" to 5" metal from can
• Floating needle from Oersted's Experiment
• Varied large lengths of number 22 insulated copper bell wire with approximately 1" of insulation stripped from all ends
• Switch or alternate commercial knife blade switch
• 4 nails

Please Read Carefully!

All experiments use safe, low-voltage battery power. Household electrical current contains high voltage that could cause serious injury. DO NOT use household electrical current for any of these experiments. ALL experiments should be conducted under adult supervision.

• Carefully follow wiring instructions for each experiment. Improper wiring can result in battery leakage and/or rupture.
• DO NOT take a battery apart. Contact with internal battery material can cause injury.
DO NOT dispose in fire, recharge, put in backwards, or mix with used or other battery types. This may cause the batteries to explode, leak and cause personal injury.

Steps to Make a Galvanometer:

1. Wrap wire around "floating needle" dish five times. Set up floating needle as in Oersted's Experiment. Connect one wire end to switch. Connect another wire end from switch to negative (-) lead of Power Pack. Connect wire from dish to positive (+) lead of Power Pack. Close the switch and observe how far and fast the needle turns.
2. Increase wire turns around the dish five more times. Repeat. Did the needle turn farther and faster?
3. Connect the bulb holder to the circuit by removing switch wire from negative (-) lead of Power Pack and connecting wire to the bulb holder. Connect negative (-) lead of Power Pack to the wire on the bulb holder.
4. Repeat steps 2 and 3 with a compass instead of the needle. Note the changes, if any.