Demonstrating-Primary-&-Secondary-Coils-RVFM-P04035-p-This-primary-&-secondary-coil-apparatus-can-be-used-to-demonstrate-the-operation-of-a-transformer-The-coils-are-wrapped-with-20-gauge-magnet-wire-with-yellow-insulated-binding-posts-as-connectors-p-RVFM-Primary-Secondary-Coil-Demonstrating-Kit-Transformer-Operation