If we he a room with fall ceiling and 8 ceiling spots connected to the power supply of the house。
如果我们房间吊顶上有8盏灯跟房子的电路相连。
In-case we he a power cut so i need 2 of these ceiling spots to light the room .
为了在断电的时候,我们仍然有2盏等可以作为应急照明。
so we need an emergency circuit (inventor , battery and switch between Battery and AC) to be connected to the 2 needed spots so when their is a blackout they switch it on the battery circuit until the electricity returns.
所以我们需要为这两盏灯连一个应急电路(电池,关等)。在断电的时候我[收起]