Two pairs of electromagnet coils, shown here in red and blue, are energized in turn by an AC supply (not shown, but coming in to the leads on the right). The two red coils are wired in series and energized together and the two blue coils are wired the same way. Since it's AC, ...
20K Did you know that magnets produce a magnetic field? When you run an electrical current through this field you create an electromagnet. Why would you want to do this? What purpose would an electromagnet have? Read on to find out. Related to...
Hard drives read and record information using magnetism: a moving electromagnet-arm reads and writes tiny magnetic zones by sweeping back and forth across a rapidly spinning disc. Flash-memory music players are slightly different: they record the digits that represent musical sounds using tiny ...