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16 mars 2005

16 mars 2005

16 mars 2005

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Svar i komplex form:Z o = 40 + j . 120 (Ω) vilket betyder att resistansen R o är 40 Ω och reaktansenmotsvarar en spole med L o = 120/200 = 0,6 H.Thevenins tvåpolekvivalent har U o = 180 + j40 (V)Nortons ekvivalent har I o = I k = 0,75 –j . 1,25 (A)Svar i ”andra former”2j⋅(ωt+a tan )9u(t)= 184,4 ⋅ e = 184,4{ cos( ωt+ 0,2187) + j sin(200t+ 0,2187) } ellerj(ωt+ α )ou o (t) = Re { 184,4 ⋅ e }≈ 184,4 cos(200t + 0.2187) (V) α ≈ 12,55j(t− a tan )4i o (t) = Re{ 1,4577 ⋅ e ω }≈ 1,4577 cos(200t – 0,3280) (A) β ≈ -59,0 o

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