In this activity, students will learn how an electromagnet works by making a simple one. Using this knowledge, students will design a diagram to make a working speaker using household materials. Then ...

This circuit has a very low power consumption, as the electromagnet is only on for about 20ms! The other major components are a LM358N op-amp, a CD4001B quad CMOS NOR gate, and IRFD-120 MOSFET.

Free interactive and download to print GCSE Physics flashcards to help prepare for your GCSE exams. Revise topics such as magnetic fields and electromagnets.