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20=I.5000(diubah ke ohm)
I=20/5000=4.10^-3 A
R = 5 kΩ = 5000 Ω
I = ?
P = V × I
P = I × R × I
P = I² × R
20 W = I² × 5000 Ω
20/5000 = I²
1/250 = I²
0,004 = I²
√0,004 = I²
0,02 A = I