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4. a. amperemeter = mengukur arus listrik
b. Ohm meter = mengukur hambatan listrik
c. volt meter = mengukur tegangan listrik

[tex]5.Perhitungan Voltmeter\\ Vab = \frac{4}{5}.10 = 8 Volt\\ Perhitungan Amperemeter\\ Iab = \frac{2}{5}.10=4Ampere\\ Rab = \frac{Vab}{Iab} = \frac{8}{4}=2 Ohm [/tex]