If bends in a wire doesn't affect its resistance, then why does a wounded coiled wire show sparks instead of plain wire?
While bending a wire itself does not significantly affect its resistance, the situation becomes more complex when dealing with wound coils, such as those found in transformers, motors, or electromagnets. Coils are not just bent wires; their geometry and winding method affect their electromagnetic properties, particularly self-inductance and mutual inductance, leading to phenomena such as sparking that do not occur with ordinary straight wires.Reasons for Sparking in Wound CoilsInductive Effects