What is the type of resistor that is used to avoid overheating and to decrease the amount of current in the primary circuit?

What is the type of resistor that is used to avoid overheating and to decrease the amount of current in the primary circuit? Correct Answer Ballast resistor

When the engine is running at a slow speed, the contact breaker point is closed for a comparatively longer period. This causes overheating of the induction coil. To avoid this a ballast resistance is inserted in the primary circuit of the coil.
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