Electricity and Magnetism

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15 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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A quick guide to what you need to
know….

Electricity and Magnetism

Top 10 Things About Electricity

Ch 21


Opposites attract, Likes repel


Conductors allow electricity through, insulators
do not


What are some conductors? Insulators?


Electrons move, not protons or neutrons


Potential Difference


difference in potential
between 2 different places


Measured in volts


Comparison of energy carried by electrons


More About Electricity…


Current


Flow of electrons through a
conductor


Measure in Amperes (Amps)


Dry Cell


electron pump due to potential
difference between terminals


Resistance

tendancy

of material to oppose
flow of electrons; changes energy


Ohm’s Law: V = I x R


Series vs. Parallel Circuits: Which is better and
why?

Top 10 (or close to) Things About Magnetism

Ch 22


Guess What? Opposites Attract & Likes Repel


All magnets have 2 poles (North and South)
and magnetic force is strongest here


Uses: Electromagnet (strong temporary
magnet), MRIs, Maglev trains, Recycling
Centers


Electric Motor


device that changes electrical
energy into mechanical energy


Generator


Produces current by rotating wire
in magnetic field


More about Magnets…


Superconductors

materials that have no
electrical resistance


No resistance means little wasted (10% of
current electricity in lines is wasted to heat