battery just something that pushes and pulls electrons.
great, simple, easy to understand explanations of electricity.
http://scitoys.com/scitoys/scitoys/radio/homemade_radio.html#impedance
coil just an electromagnet. moving electricity in a circle makes a magnetic field.
collapsing magnetic field generates electricity.
CAPACITOR:
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pos charges are pulling electrons to it... closer plates are, more it can pull. so larger difference can be sustained.
add capacitors in series to lower capacitance. neat trick! not a trick, but useful.
RC circuit:
demonstration how electricity builds up magnetism
how collapsing magnetism builds up electricity.
height and width of a balloon that you push with your hand!! good analogy.
polarized light: all electrons moving in same direction.
glare from lake: bounching off at same angle.
some materials have atoms aligned in rows. only let light through if parallel.
