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Ra = Va²/Pa⇒ Ra = 12²/6 = 24 Ω
cari hambatan lampu B
Rb = Vb²/Pb ⇒ Rb = 12²/9 = 16 Ω
Ia = Rb/(Ra+Rb) * I tot
Ia = 16/(24+16) * 500 mA = 200 mA
Pa = Ia² × Ra⇒ Pa = 0,2²×24 = 0,96 watt