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Trong đoạn mạch gồm hai điện trở mắc nối tiếp thì U = U1 = U2; I = I1 + I2; Rtđ = R1 + R2 U = U1 + U2; I = I1 = I2; Rtđ = R1 + R2. U = U1 + U2; I = I1 + I2; Rtđ= R1 + R2. U = U1 = U2; I = I1 = I2; Rtđ = R1 + R2.
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