A
a material that allows electrons to flow through it easily
what is conductor
a material through which electrons do not easily flow
what is insulator
a car battery is an example of a _____ cell battery
what is wet
a path that allows only one rout for an electric current
what is series circuit
contains a piece of metal that bends when it gets hot
what is circuit breaker
to stop electrical wires from overheating
what is circuit breaker and fuses
a large discharge of static electricity
what is lightening
opposite charges ________ and like charges ________
what is attract and repel
electric charge that has accumulated on an object (clothes, carpet, hair) is referred to as
what is static electricity
current doesn't flow because the path is not complete
what is open circuit
atoms become charged by gaining or losing
what is electrons
two ways to transfer electric charge
what is charge by contact (touch)
what is charge by induction (rearrangement of electrons)
Which are conductors and which are insulators
nail, glass, wire, cotton ball, penny, paper
a magnetic field causes domains to
what is align
the tendency for a material to oppose the flow of electrons is
what is resistance
current that flows in only one direction through a wire
what is direct
the regions on a magnet where the magnetic force is strongest
what is magnetic poles
all magnets have a _____ and a _____ pole
what is north and south
a group of atoms with aligned magnetic poles
what is magnetic domains
electromagnets change ______ energy into _____ energy
what is electrical to mechanical
what is iron, cobalt, nickel
the function of a generator is to change
mechanical energy to electrical energy
doing what three things to wire can increase its resistance
what is make thinner, longer, or hotter
adding more turns to the wire coil ____ the strength of an electromagnet
what is increases
identify the metal that is often used in wires that conduct electricity
explain why homes use parallel circuits instead of series circuits
what is houses are wired parallel so if one light goes out they don't all go out
Ohm's law states that the current equals _____ divided by resistance
what is voltage difference
current is the flow of
electrons
a magnetic _____ is a grouping of billions of atoms that all have magnetic fields lined up in the same way
what is domain
a _____ is a strong magnet that can be turned on and off by removing the electrical source
what is electromagnet