electricity
Unlike charges _________ each other
attract
an electric current will always follow the path of ...
least resistance
a _________ must be replaced after too much current in it causes it to melt
fuse
what is an example of a conductor?
silver, gold, copper, steel, sea water, other metals
the type of current produced by a battery
direct current
the build up of charges on an object is called
static electricity
a complete, unbroken path through which electric charges can flow
electric circuit
what causes charges to move in a circuit?
voltage difference
what is an example of an inductor?
rubber, plastic, dry wood, glass, oil, diamond
a temporary magnet made by wrapping a wire coil carrying a current around an iron core.
electromagnet
protons are ______, and electrons are ______________
positive; negative
which type of energy is associated with electric currents?
electrical energy
in a __________ circuit, there is only one path for current to take.
series
Strength of force between two magnets depends on the _______________ between them.
distance
an electric motor transforms __________ energy into mechanical energy
electrical
what is the law of conservation of charge
electric charges can be transferred from object to object, but it cannot be created or destroyed
what is charging by contact?
process of transferring charge by touching or rubbing
a device used to open and close an electric circuit is a
switch
______________________ are made by placing a magnetic material in a strong magnetic field, forcing magnetic domains to line up.
permanent magnets
how can the strength of a magnetic field be increased?
adding more turns to the wire coil or increasing the current through the wire
what is charging by induction?
rearrangement of electrons on a neutral object caused by nearby charged objects
net movement of electric charges in a single direction through a wire or conductor.
electric current
tendency for a material to oppose the flow of electrons, changing electrical energy into thermal and light energy.
resistance
the region around a magnet where the magnetic force is exerted is known as the
magnetic field
a __________ is a coil of wire that has a current
solenoid