戴维南定理解题步骤
断开R3;
等效电压 U = Us2 + R2 压降 = Us2 + R2 * ( Us1 - Us2 )/( R1 + R2 )
= 15 + 3( 20 - 15 )/( 5 + 3 ) = 135/8 v;
等效电阻 R = R1//R2 = 3 * 5/( 3 + 5 ) = 15/8 Ω;
Is = U/( R3 + R ) = (135/8)/( 2 + 15/8 ) = 135/31 A 。
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断开R3;
等效电压 U = Us2 + R2 压降 = Us2 + R2 * ( Us1 - Us2 )/( R1 + R2 )
= 15 + 3( 20 - 15 )/( 5 + 3 ) = 135/8 v;
等效电阻 R = R1//R2 = 3 * 5/( 3 + 5 ) = 15/8 Ω;
Is = U/( R3 + R ) = (135/8)/( 2 + 15/8 ) = 135/31 A 。
下一篇:骨水泥一般分为四种形态,分别是