a. Hambatan pengganti
1/Rp = 1/20+1/30+1/60= 6/60
Rp = 60/6 = 10 ohm
b. Daya listrik
P = V²/Rp = 120²/10
P = 14400/10 = 1440 watt
c. Energi listrik
W = P.t = 1440. 5. 60
W = 432000 J
W = 432 kJ
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a. Hambatan pengganti
1/Rp = 1/20+1/30+1/60= 6/60
Rp = 60/6 = 10 ohm
b. Daya listrik
P = V²/Rp = 120²/10
P = 14400/10 = 1440 watt
c. Energi listrik
W = P.t = 1440. 5. 60
W = 432000 J
W = 432 kJ