GCSE Physics (AQA)

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Using Solenoids

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Magnetism and electromagnetism The motor effect

Using Solenoids

7:20 Induced Magnetism
Spec 4.7.2.1
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  • Electromagnets are solenoids with an iron core.
  • A solenoid is a wire coiled many times, creating a magnetic field when current passes through it.
  • The direction of the current determines the direction of the magnetic field and the magnetic poles.
  • Inserting an iron core into the solenoid creates an electromagnet, which produces a stronger magnetic field than a solenoid alone.
  • Electromagnets are useful in various applications, such as lifting heavy objects like cars with cranes.
  • Electromagnets can be turned off by stopping the current, making them more practical than permanent magnets.
  • Electromagnets are used in electronic locks, where they release a door bolt when activated.
  • In high current circuits, electromagnets can safely close switches from a distance, reducing the risk of electric shock.
  • A relay system uses an iron bar and an electromagnet to safely operate high current circuits.
  • Understanding how to interpret circuit diagrams involving solenoids and electromagnets is important for exams.
  • Electromagnets are used in applications like electronic bells, alarms, and relays.
  • Relays involve a solenoid or electromagnet moving an iron bar to complete a circuit, allowing safe operation of high current systems.

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