Educational Single Knife Switch for Circuit Demos

Single Knife Switch – Classic Circuit Control Tool for Physics Labs & Educational Demonstrations

The Single Knife Switch is a timeless educational tool used in physics labs and electronics classrooms to teach the basic principles of electricity and how simple circuits operate. This mechanical switch features a metal lever (“knife”) that manually opens or closes a circuit when engaged, giving students a clear, hands-on understanding of current flow and control.

Perfect for demonstrations, experiments, and science fairs, the switch helps visually reinforce concepts like open vs. closed circuits, conductivity, and switching mechanisms.

Specifications:

• Switch Type: Single-pole, single-throw (SPST)

• Base Material: Insulated plastic or wood

• Conductors: Metal lever and contacts (typically brass or steel)

• Mounting: Bench or flat surface

• Connection Method: Screw terminals or binding posts for wires

• Voltage/Current Rating: Low-voltage DC circuits (for educational use only)

Features:

• Demonstrates open and closed circuits visually and physically

• Simple, durable design ideal for repeated classroom use

• Compatible with low-voltage batteries, bulbs, and other lab tools

• Great for teaching electricity, current direction, and control

• A staple in school science kits and physics education

This knife switch is a must-have component for interactive circuit learning in elementary through high school settings.