Expansion spring
Electrical connectors

Expansion springs are used as electrical connectors in some children's electronics kits. They are easy to use with bare fingers, they accept multiple wires, they require no learning or expertise to use them, and the cost is low.
Kits employing these connectors also have the secondary advantage that many additional projects can be made if the components are removed from the springs, and components strung between the springs instead of wires. For even more projects, these kits usually have enough space to add further springs.
Their major limitation is that spring connectors can not accept integrated circuit chips.
Sources and credits
This article is adapted from the Wikipedia article “Expansion spring”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Vintage Heathkit Jr Electronic No. 2 Experimenters Lab, Daystrom Products Corp., Made In USA, Circa 1960 (16635866931).jpg by Joe Haupt from USA, CC BY-SA 2.0
Fathomly is not affiliated with or endorsed by the Wikimedia Foundation. Spotted a problem? Tell us.