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R :
1/Rp = 1/20 + 1/30 + 1/60
1/Rp = 3+2+1/60
1/Rp = 6/60
Rp = 60/6 = 10 ohm
t = 5 menit = 5 x 60 = 300 s
Jawab : W = I^2.R.t
= 9.10.300
= 27000 Joule ( b )
Rp = (1/R₁ + 1/R₂ + 1/R₃)⁻¹
= (1/20 + 1/30 + 1/60)⁻¹
= (1/10)⁻¹ = 10 Ω
E = Pt
E = VIt
E = I² Rp t
= (3)²(10)(300) = 27000 J
Jawaban: B.