Capacitors are electricity storage units, places where
electricity can build up to higher levels. They smooth out
variations in power flow. Capacitors block the flow of direct
current or limit the flow of alternating current. Direct current
is the type of current generated by batteries - not the kind
that comes from wall sockets. Many battery powered devices also
have AC (alternating current, the kind that comes from wall
sockets) adapters so they can run on household current as well.
Alternating current is the type of current available through
wall sockets. Any device that does not run on batteries is
called an AC device. Many battery powered devices (DC) have AC
adapters so they can run on alternating current as well.
Resistors reduce the flow of electricity. (like friction)
Resistors give electricity something to do. Electricity without
something to do is a short circuit and a bad thing so you will
have to at least some resistance in every circuit. Resistors
usually have two leads with no polarity (no posi