檢視簡易小馬達的原始碼

===實驗===
<img src='http://science4everyone.net/file/%E5%BC%B5%E9%88%9E%E7%A5%BA/1580785098395.jpg' width='500px'/>

<img src='http://science4everyone.net/file/%E5%BC%B5%E9%88%9E%E7%A5%BA/1580785651976.jpg' width='700px'/>


<videoflash>O-_KuFJTCOQ</videoflash>
<videoflash>Tpu7a8awlSU</videoflash>

===探究問題===