Menyalakan lampu hanya saat perlu bisa menghemat energi di rumah.

the house

Breakdown of Menyalakan lampu hanya saat perlu bisa menghemat energi di rumah.

• di: at
• menyalakan: to turn on
• lampu: the light

Questions & Answers about Menyalakan lampu hanya saat perlu bisa menghemat energi di rumah.

What exactly does menyalakan mean, and how is it built from the root word?

Menyalakan means “to turn on / to switch on (something that gives light, sound, etc.)”.
The root is nyala (to be lit / to be on), and menyalakan is:

• meN- prefix (verb marker)
• -kan suffix (often makes it causative: “to make X do/be Y”)

So nyala = “to be lit / on”
menyalakan (lampu) = “to make the lamp be on” → “to turn on the light”.

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What is the grammatical role of Menyalakan lampu hanya saat perlu in this sentence?

The whole chunk Menyalakan lampu hanya saat perlu functions as the subject of the sentence.
So the structure is roughly:

• Subject: Menyalakan lampu hanya saat perlu
• Predicate: bisa menghemat energi di rumah

You can think of it like English: “Turning on the light only when necessary can save energy at home.”
The -an verb (menyalakan) at the start works similar to an English -ing verb phrase used as a subject.

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Why is there no subject pronoun like kamu or kita in this sentence?