This category is about electric and the magnetic fields. A non-zero electric field is produced by the presence of electrically charged particles, and gives rise to the electric force; this is the force that causes static electricity and drives the flow of electric charge (electric current) in electrical conductors. The magnetic field, on the other hand, can be produced by the motion of electric charges, or electric current, and gives rise to the magnetic force associated with magnets. The term "electromagnetism" comes from the fact that the electric and magnetic fields generally cannot be described independently of one another. A changing magnetic field produces an electric field (this is the phenomenon of electromagnetic induction, which underlies the operation of electrical generators, induction motors, and transformers). Similarly, a changing electric field generates a magnetic field.
How Batteries Work
[ Teens/Mature Teens ] Shows the basic concepts behind these components which power all sorts of things such as cars, PCs, cameras, and cell phones.
How Capacitors Work
[ Teens/Mature Teens ] Information about this component which plays a crucial role in electronics as it stores electrons for when they're needed most, dumping a huge charge instead of a steady flow.
How Electricity Works
[ Teens/Mature Teens ] Features detailed information on the subject such as basic concepts, units, circuits, generators, and uses.
How Electromagnets Work
[ Teens/Mature Teens ] Information about what makes this key part of motors, tape decks, VCRs and other devices.
How Metal Detectors Work
[ Teens/Mature Teens ] Explains their uses and the electromagnetic properties that allow these units pinpoint and identify their target.
Science Snacks About Magnetism
[ Kids/Teens ] A set of very simple experiments, featured by Exploratorium, each one with details on materials, assembly, how to do, and an explanation of the physical laws involved.
Snap Crackle Jump
[ Kids ] An edible physics experiment with static electricity and Rice Krispies.
Last update:January 14, 2016 at 6:15:04 UTC
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