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Centrifugal pumps are widely used to meet household water demands, but their performance may vary with changes in rotational speed settings. This study aimed to analyze the performance characteristics of a centrifugal pump with a nominal power rating of 125 W at dimmer settings of 50%, 60%, 70%, 80%, 90%, and 100%. An experimental method was employed through direct testing for 300 seconds at each dimmer setting. The measured parameters included voltage, current, rotational speed, water volume, flow rate, and pressure. The measurement data were used to calculate pressure head, hydraulic power, apparent electrical power based on the product of voltage and current, and an initial efficiency ratio. The results showed that rotational speed increased from 1,630 RPM at a 50% dimmer setting to 2,959 RPM at 100%. The highest flow rate was obtained at 70%, reaching approximately 0.0000933 m³/s, whereas the highest pressure and pressure head were recorded at 100%, at 2.6 bar and 26.50 m, respectively. Hydraulic power increased from 2.67 W to 21.67 W, while the initial efficiency ratio increased from 3.53% to 10.37%. These findings indicate that variations in dimmer settings are associated with changes in pump performance characteristics, with the highest flow rate at 70% and the highest pressure at 100%. The calculated efficiency ratio remains preliminary and cannot yet be used to determine the actual pump efficiency. ABSTRAK Pompa sentrifugal banyak digunakan untuk memenuhi kebutuhan air rumah tangga, tetapi kinerjanya dapat berubah akibat variasi pengaturan kecepatan putar. Penelitian ini bertujuan menganalisis karakteristik kinerja pompa sentrifugal berdaya nominal 125 W pada variasi pengaturan dimmer 50%, 60%, 70%, 80%, 90%, dan 100%. Penelitian menggunakan metode eksperimen melalui pengujian langsung dengan durasi 300 detik pada setiap variasi dimmer. Parameter yang diukur meliputi tegangan, arus, kecepatan putar, volume air, debit, dan tekanan. Data hasil pengukuran digunakan untuk menghitung head tekanan, daya hidrolik, daya semu listrik berdasarkan hasil perkalian tegangan dan arus, serta rasio efisiensi awal. Hasil penelitian menunjukkan bahwa kecepatan putar meningkat dari 1.630 RPM pada dimmer 50% menjadi 2.959 RPM pada dimmer 100%. Debit tertinggi diperoleh pada dimmer 70%, yaitu sekitar 0,0000933 m³/s, sedangkan tekanan dan head tekanan tertinggi diperoleh pada dimmer 100%, masing-masing sebesar 2,6 bar dan 26,50 m. Daya hidrolik meningkat dari 2,67 W menjadi 21,67 W, sementara rasio efisiensi awal meningkat dari 3,53% menjadi 10,37%. Hasil tersebut menunjukkan bahwa variasi pengaturan dimmer berkaitan dengan perubahan karakteristik kinerja pompa, dengan debit tertinggi pada pengaturan 70% dan tekanan tertinggi pada pengaturan 100%. Rasio efisiensi yang diperoleh masih bersifat awal sehingga belum dapat digunakan untuk menentukan efisiensi aktual pompa.
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Abigail et al. (2026) studied this question.
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