Practice question

What is the purpose of a relay in a vehicle's headlight circuit?

  1. To produce the high voltage needed to ignite xenon gas in HID headlights
  2. To switch the high current of the headlights using a low current from the headlight switch, protecting the switch from overheating
  3. To measure the battery voltage
  4. To filter the fuel

Answer: B — To switch the high current of the headlights using a low current from the headlight switch, protecting the switch from overheating

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