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Kuat arus (I) = 0,5 kilo ohm = 5×10^2 Ohm
V= I×R
= 4 × 10^-2 × 5 × 10^2
= 20 V
= 40mA . 0,5 kohm
= 40 x 10^-3 A. 0,5 x 10^3 ohm
= 20 volt