Auto Electrical Relays Explained - How they work and where they're used.

Educational Mechanics
1 May 201601:30

Summary

TLDRThis video explores the function and applications of auto electrical relays, which act as switches controlled by a small electrical current. Central to a relay is an electromagnet that, when energized, closes contact points to allow high power circuits to operate. A special type, the double-throw relay, can switch between normally open and normally closed contacts, commonly used in vehicles for switching between low and high beam headlights.

Takeaways

  • 🔌 Relays are electrical switches controlled by a small current.
  • 🚗 They are commonly used in vehicles for high power circuits like spotlights.
  • 🧲 The core component of a relay is an electromagnet that operates the switch.
  • 💡 When energized, the electromagnet attracts an armature blade to close the contact points.
  • 🔋 The relay allows a larger current to flow through its contacts when the small switching current is applied.
  • 🔄 Advanced double-throw relays, or change-over relays, have two outputs: normally open and normally closed.
  • 🔄 In rest position, the normally closed contacts allow current to flow to the circuit.
  • 🔄 When activated, the electromagnet breaks the current to the normally closed contacts and opens the normally open side.
  • 💡 The double-throw relay is often used in car headlights to switch between low and high beams.
  • 🔍 The script explains the basic operation and applications of auto electrical relays in a clear and concise manner.

Q & A

  • What are auto electrical relays?

    -Auto electrical relays are switches that are turned on or off by a small electrical current, and are used in vehicles for various applications, including the switching of high power circuits.

  • What is the primary function of a relay in a vehicle?

    -The primary function of a relay in a vehicle is to control the switching of high power circuits, such as spot lights, using a small electrical current.

  • What is the core component of an auto electrical relay?

    -The core component of an auto electrical relay is an electromagnet, which when energized, attracts an armature blade and closes contact points to allow current flow.

  • How does an electromagnet in a relay affect the flow of current?

    -When the electromagnet in a relay is energized by a small current, it attracts the armature blade, closing the contact points and allowing a larger current to flow through to the high power circuit.

  • What is the purpose of the contact points in a relay?

    -The contact points in a relay allow the flow of current from the relay to the high power circuit once the electromagnet is energized and the armature blade closes the contacts.

  • What is a double throw relay, and how does it differ from a standard relay?

    -A double throw relay, also known as a changeover relay, has two outputs: one normally open and one normally closed. It differs from a standard relay by allowing current to switch between these two states when the electromagnet is energized.

  • In what position does a double throw relay allow current to flow from the source to the circuit?

    -In the rest position, the normally closed contacts of a double throw relay allow current to flow from the source to the circuit.

  • How does a double throw relay switch from one state to another?

    -When the electromagnet in a double throw relay is energized, it attracts the armature, breaking the current to the normally closed contacts and closing the contacts for the normally open side of the relay.

  • What is a common application for double throw relays in vehicles?

    -A common application for double throw relays in vehicles is to switch car headlights from low to high beam.

  • Why are relays preferred for high power circuits instead of direct switching?

    -Relays are preferred for high power circuits because they allow the use of a small switching current to control a much larger current, reducing the risk of damage to the control system and providing better control.

  • How does the relay ensure continuous operation of high power circuits?

    -As long as the small switching current continues to flow to the relay, the larger current will flow through its contact points, ensuring continuous operation of the high power circuits.

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関連タグ
Auto RelaysElectrical SwitchesVehicle ElectronicsHigh Power CircuitsSpotlightsHeadlightsElectro MagnetCar MaintenanceRelay TypesAutomotive Tech
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