Lampu bertuliskan 120W/220V dipasang pada tegangan 110Vberapa daya lampu?
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Diketahui V = 220V
P=120W
ditanya P110.........?
jawab : cari terlebih dahulu resistornya
R= V²/P = 220² /120 =40 1/3
P110 = V²/R = 110²/40 1/3
12.100/40 1/3
30 watt