To Be Lit
To Be Ignited, To Be On, To Come On
intransitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb.
The kanji 点 means point, but this verb actually means to be lit or to be ignited. Think of it this way, when a flashlight turns on, it points a beam, of light.
You already learned 点ける, which is for when you turn something on. 点く, on the other hand, is an intransitive verb. That means it happens by itself. Like, "Oh look! The lights came on! That's cool (く)!"
You already learned this reading when you learned 点ける but here's a mnemonic just in case:
Every time you count to two (つ) a light comes on. How cool (く) that it does it all by itself!!
ライトが点く
the light turns on
電気が点く
the light turns on
明かりが点く
the light turns on
人が来ると、セキュリティのためのライトが点くんです。
When people come, the security lights turn on.
やっとキャンドルに火が点いて、テーブルの上は明るくなりました。
Finally the candles were lit, and the tabletop got brighter.
「アレクサ、電気を点けて」と言うと、家の全ての電気が点きます。
When I say "Alexa, turn the lights on," all the lights in the house turn on.