Hoʻokumu ʻia ka coil air core i ʻelua ʻāpana, ʻo ia hoʻi ke kumu ea a me ka coil.Ke ʻike mākou i ka inoa, ʻike maoli ʻia ʻaʻohe mea i waenakonu.ʻO nā wili he mau uea i ʻeha ʻia i ka pōʻai ma ka pōʻai, a ua hoʻokaʻawale ʻia nā uea mai kekahi i kekahi.