Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it. ขนาดของไฟล์ 134 KB คลิกค่ะ
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Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it. ขนาดของไฟล์ 134 KB คลิกค่ะ |
