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P1 = 100 watt, V1 = 110 volt
P2 = 100 watt, V2 = 110 volt (lampu kembar identik)
V = 110 volt
P total =..?
JAWAB:
R = V²/P
tinjau lampu 1 :
R1 = V1²/P
R1 = 110²/100
R1 = 12100/100
R1 = 121 Ω
R1 = R2 (karena kembar identik)
1/R total = 1/R1 + 1/R2 (pararel)
1/Rtotal =1/121 + 1/121
1/Rtotal = 2/121
Rtotal = 121/2
Rtotal = 60,5 Ω
Daya untuk 2 lampu adalah:
= V²/Rtotal
= 110²/60,5
= 12100/60,5
= 20 Watt