Lesson 5 of 6

Stronger electromagnets

Goal: Investigate what changes the strength of an electromagnet.

Puzzles for this lesson

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An electromagnet lifting a long bunch of paper clips

Three things make an electromagnet stronger. You can test its strength by counting the paper clips it holds.

  • More turns on the coil.
  • A bigger current in the coil.
  • An iron core inside the coil.
  • Make it a fair test. Change one thing at a time and keep the others the same.

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Key words in this lesson

Electromagnet A magnet that is turned on and off by the current through it

Core The piece of soft iron that a coil is wound round

For teachers: AQA 3.2.3 · Pearson Edexcel 33.9 · Cambridge 8Pe.03