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6.
I = 60 mA = 6×10-² m
t = 5 menit = 300 s

I = Q / t ↔ Q = I . t
Q = 6×10-² . 3×10²
Q = 18 C

10.
V = 12 V
R = 48 ohm
t = 10 menit = 600 s

W = (V² / R) . t
W = (12² / 48) . 600
W = (144/48) . 600
W = 3 . 600
W = 1800 J

12.
rangkaian disusun pararel :
1/Rp = 1/24 + 1/12
1/Rp = 3/24
Rp = 24/3
Rp = 8 ohm

W = V²/R × t
W = 6² / 8 × 120
W = 4,5 × 120
W = 540 Joule