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Materials

• Voltage sensor
• 1 9V battery (fully charged)
• 1 D or C cell battery (fully charged)
• 3 AA batteries (fully charged)
• 1 miniature holiday bulb with stripped wire ends
• 1 paperclip
• 1 penny
• 1 plastic spoon
• 1 rubber band
• 1 mechanical pencil lead
• 1 eraser
• 1 piece of chalk