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DIY新年吉祥物紐扣畫
$4.90
Comprising 2 to 6V d.c. dynamic motor mounted on a box channel
with two 4 mm sockets. Dimensions 90 x 65 x 30 mm height
中學的教學和實驗用儀器，可交直流兩用，主要用途是：經過拆裝，使學生熟悉電動機的主要結構。驗證電樞轉向跟電流方向、磁力線方向間的關系。掌握電動機工作的旋轉原理。
