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Difficulty: EasyElectromagnetism and Induction

Match each electromagnetic component to its primary operating principle or function.

  • SolenoidConverts electrical energy into linear mechanical motion using a movable plunger
  • TransformerTransfers electrical energy between circuits through mutual electromagnetic induction
  • RelayUses an electromagnetic coil to mechanically open or close electrical switch contacts
  • InductorStores energy in a magnetic field and opposes changes in electrical current

Answer

Solenoid pairs with converting electrical energy into linear mechanical motion; Transformer pairs with transferring electrical energy via mutual electromagnetic induction; Relay pairs with using an electromagnet to actuate switch contacts; Inductor pairs with storing energy in a magnetic field to oppose current changes.
Each electromagnetic component performs a unique function based on electromagnetic principles: solenoids produce direct mechanical stroke; transformers transfer power across isolated windings via alternating magnetic flux; relays actuate circuit contacts remotely via electromagnetic force; and inductors provide inductive reactance and self-induced counter-EMF.

Step-by-Step Solution

1
Identify the primary mechanism of a solenoid.
A solenoid converts magnetic force into linear mechanical movement.
When energized, the coil's magnetic field draws an iron core inward to actuate a mechanical load.
2
Identify the operating principle of a transformer.
A transformer utilizes mutual induction across coupled coils.
Changing current in the primary coil induces an alternating voltage in the secondary coil without direct electrical connection.
3
Identify the primary function of an electromechanical relay.
A relay operates switch contacts using electromagnetic attraction.
An electromagnet pulls an armature to switch a separate circuit on or off.
4
Identify the foundational circuit property of an inductor.
An inductor stores magnetic energy and opposes changes in current flow.
By Lenz's and Faraday's laws of induction, self-inductance generates counter-electromotive force when current changes.

Key Concept

Electromagnetic Components and Operating Principles
Estimated Time:45s
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Topics

Electromagnetism and Induction

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