The output power mechanism of a separately excited DC motor can be equivalent to a variable resistance, which is parallel with the armature winding of the motor.
若将他励直流电动机输出功率的机理等效为一个与电动机电枢绕组并联的可变电阻，可以得到他励直流电动机可变电阻型等效电路图。
During the measuring of the DC resistance of a transformer's winding, the winding is equivalent to a resistance-inductance series circuit.
在进行变压器绕组直流电阻的测量时，变压器绕组可以等效为一个由电阻、电感组成的串联电路。
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