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statistik – fisika itu sunatullah
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Root-Mean-Square (rms)

Seorang tweep meminta saya menulis konsep arus atau tegangan rms. Pertanyaan serupa juga pernah saya terima lewat email terkait tulisan “Arus bolak-balik, apa itu?”. Di samping itu, sudah lama saya tidak menulis blog, saya pikir baik juga memulai untuk saya menuliskan tentang rms.

Banyak cara memulai pembahasan tentang rms. Yang paling mudah mungkin dari bahasa. Root-mean-square artinya “dikuadratkan, lalu diambil rata-ratanya, kemudian diakarkuadratkan”. Jadi, kalau ada sebuah sekumpulan pengukuran {\(x_i\)} (dengan indeks \(i = 1, 2, \ldots , N\) menunjukkan nilai pengukuran ke-\(i\)), untuk mendapatkan nilai rms-nya:

  1. kuadratkan setiap nilai pengukuran: \({x_1}^2, {x_2}^2, \ldots, {x_N}^2\)
  2. rata-ratakan, \(\frac{1}{N}\sum_i^N{(x_i)^2} = y\)
  3. dan akar kuadratkan, \(\sqrt{y} = x_\text{rms}\)

Langkah kedua menunjukkan bahwa sesungguhnya yang kita lakukan adalah mencari nilai rata-rata.

Pertanyaan penting sekarang adalah, “Kenapa mencari rata-rata harus pakai rms?”. Konsep rms berasal dari statistik, sebuah seni matematika untuk menganalisis angka-angka hasil pengukuran. Mari kita pelajari konsep ini dari contoh berikut.

Kuliah Metode Fisika Eksperimental 2009/2010

Berikut adalah kuliah FII311 Metode Fisika Eksperimental (lebih dikenal dengan MFE) di Departemen Fisika, Universitas Airlangga, yang saya ampu pada semester genap 2009/2010.

Mengenai kuliah ini

Kuliah ini secara garis besarnya menjawab pertanyaan, “what to do with my data after I have done my experiment,” atau pengolahan data atau data mining. Mengenai teknik eksperiment dan teknik pengambilan data dipelajari pada kuliah eksperimen fisika.

Don`t copy text!

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