... R1 + R2 vỡ (ZL = ZC P1 = - Khi ó ni tt, ta cú: R1 = U2 (1 ) R1 + R R + Z2 (2 ) v tan MB = ZL = 3R (3 ) L U (R1 + R ) Cụng sut P2 = (4 ) (R1 + R )2 + Z2 L U2 T (2 ); (3 ); (4 ) P2 (6 ) 4R U2 = 120 (W) ... chiu u = 200 cos(100 t ) (V) Biu thc cng dũng in l: )(A) C i = cos(100 t + )(A) )(A) D i = cos(100 t + )(A) A i = cos(100 t - B i = 0,5 cos(100 t + Bi 2Cho mch in xoay chiu gm in ... tr: Z = B ZL = L = 20 0() , ZC = 1/(C = 8 0( ) = 13 0( ). Cng hiu dng: I = U/Z = 2(A); Cụng sut: P = I (R+r) = 200(W). lch pha gia u v i : tg = (ZLZC./(R+r)=2,4 = 1,176(rad) (= 57,40) Biu thc...