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Voltage Demonstrator

Item # 98-7000

Regular price $29.95
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The Voltage Demonstrator is the perfect tool to engage with students and introduce the fundamentals of electricity! With its impossible-to-miss sound and visuals, this tool helps you take the interrelationship of voltage, current, and resistance off the whiteboard and into a discussion.

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Making the Invisible Visible

An Arbor Scientific exclusive, the Voltage Demonstrator brings the classroom alive with sound and visuals that other methods of demonstration can’t match. It’s the perfect tool to introduce the fundamentals of electricity!

Utilizing clear plastic components and plastic spheres, the Voltage Demonstrator allows for instructing the principles of voltage, current, and resistance like never before. Gravitational potential is used to power the potential difference (voltage), and showcases electrons in the “wire.” The plastic beads can flow at a trickle, or cascade through the tube to the collection bottle below. You have full control of the “voltage” by changing the angle of the device! Students can really see the positive correlation between voltage and current.

The Voltage Demonstrator can be fully disassembled to save space in your lab equipment storage. With one large and two small bottles, students can visualize how batteries of different sizes can have the same voltage. As most science teachers are aware, the Voltage Demonstrator is NOT an actual representation of how Voltage in a circuit works, but it is a further tool for your teaching of electricity. Electrons do not flow in a circuit like water or the beads but engage in electron drift, which is usually taught at AP or College-level Physics/Electrical Engineering courses.


WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to

Products being sold are not toys. They are for Educational / Laboratory use only. They are not for use by children 12 and under.


What’s Included

  • Clear guide tubes (2)
  • 3D printed friction fit collars with threads to adapt tubes to bottles (2)
  • 3D printed center connector to attach both tubes together
  • 1 L bottle
  • 250 mL bottles (2)
  • White beads, enough to completely fill 250 mL bottle

Features & Specs

  • Overall length (assembled): 70" (178 cm)
  • Small bottle volume: 250 mL
  • Large bottle volume: 1 L
  • Clear tube length: 28" (77 cm)