Pd_joule

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Penerapan Persamaan Differensial Pada Sistem Listrik Perhatikan gambar rangkaian listrik berikut ini:

Rangkaian R-L seri dihubungkan dengan sumber arus bolak-balik yang memiliki frekuensi angular 60π rad/s yang beramplitudo 10 volt. Jika R = 8Ω, L = 2H. Tentukan : a. Arus efektinya ! b. Bila sudut fase rangkaian tersebut adalah 90°, berapa nilai dari arus efektif rangkaian tersebut? Penyelesaian : Diketahui : ω = 60π rad/s

R = 8Ω

Vm = 10 volt

L = 2H

V = Vm sin ωt

t = 0 dan

V = 10 sin 60πt Ditanyakan : i ? Jawab : a. VL + VR = V L

+ Ri = V

0

2

+ 8i = 10 sin 60πt

i

=

i

=5

sin 60πt

i =5 bila t = 0, i = 0, maka

Jadi, i=5 dimana, dan Sehingga, i=

i= b. Jika t = 0 dan Maka, I =

i=

i=

i=

0

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