The resistance between the armature terminals is called armature resistance. It is generally represented by Ra. The value of armature resistance is usually quite small (less than 1 Ω). Armature resistance depends upon the following factors:
- Length, area of cross-section, and material of armature winding.
- Type of armature winding, that is, lap or wave winding. This will show the manner in which the conductors (i.e., their series-parallel combination) are connected.
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