Physics · DC Machines
Which of the following represents the correct expression for the armature current (Ia) of a DC series motor? (Where Vi = input voltage, Ea = back EMF across armature, Ra = armature winding resistance, and Rf = field winding resistance)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Ia = Vi / (Ra + Rf)
- 2Ia = (Vi - Ea) / (Ra - Rf)
- 3Ia = (Vi - Ea) / (Ra + Rf)✓
- 4Ia = (Vi + Ea) / (Ra + Rf)
Correct answer
Ia = (Vi - Ea) / (Ra + Rf)
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