What is the type of resistor that is used to avoid overheating and to decrease the amount of current in the primary circuit?(a) Ballast resistor(b) Thermistor(c) Photoresistor(d) RheostatsThe question was posed to me during an online exam.Question is taken from Types of Ignition System topic in division Conventional Ignition System of Automotive Engine Design

What is the type of resistor that is used to avoid overheating and to

1.	What is the type of resistor that is used to avoid overheating and to decrease the amount of current in the primary circuit?(a) Ballast resistor(b) Thermistor(c) Photoresistor(d) RheostatsThe question was posed to me during an online exam.Question is taken from Types of Ignition System topic in division Conventional Ignition System of Automotive Engine Design
Answer» The CORRECT choice is (a) Ballast resistor The explanation: 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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