Using electricity and magnetism
a device that uses an electromagnet to measure small currents is called
a galvanometer
what does a commutator consist of
a ring split in half.
the group of wire loops wrapped around an iron core in an electric motor is called an
armuter
if a wire with a current is placed in the magnetic field of two magnets, the wire moves. why?
because it is the magnetic field attracting or repelling
as a commutator moves, it slides past two contact points called
brushes.
a device that reverses the current through an electric motor is a
commutator
direct current
consists of charges that flow in one direction
a current consisting of charges that flow in one direction only
direct current
a generator uses motion in a magnetic field to produce an
electric current
what is used the pointer of a galvanometer?
electric current
a device that transforms mechanical energy into electrical energy.
electric generator
a device that transforms electrical energy into mechanical energy
electric motor
a device that uses an electric current to turn an axle is called a
electric motor
a device that uses electric current to turn the blades of a blender is an example of an
electric motor
an electric generator is the opposite of an
electric motor
how is an electric motor the opposite of an electric generator?
electric motor changes electric energy to mechanical energy
the energy associated with electric current is called
electrical energy
an electric motor turns an axle by transforming
electrical energy into mechanical energy.
when a wire with a current is placed in a magnetic field, what energy transformation occurs?
electrical energy is transformed into mechanical energy.
what energy transformation occurs in an electric motor?
electrical energy to mechanical energy
generating an electric current from the motion of a conductor through magnetic field is called
electromagnetic induction
the relationship between electricity and magnetism
electromagnetism
the ability to move an object some distance is called
energy
mechanical energy
energy that moves an object
electric current can be measured with a device called a
galvanometer
the rotation of a wire loop in a magnetic field is the basis of a
galvanometer.
a device that transforms mechanical energy into electrical energy is called an
generator.
a transformer
is a device that increases or decreases voltage.
an electric current is induced in a conductor when the conductor moves through a
magnetic field
a moving fan blade has a type of energy called
mechanical energy
the energy an object has due to its movement or position
mechanical energy
and the energy an object has due to its movement or position is called
mechanical energy.
the parts of a generator that rotate with the wire loop make contact with the brushes are called
slip rings
a coil of wire with a current
solenoid
a transformer that decreases voltage is called a
step down transformer
a transformer that increases voltage is called a
step up transformer
How do drivers of cars use galvanometers?
tells you when to get gas.
alternating current
that consists of charges that move back and fourth in a circuit.
energy
the ability to move an object over a distance
what is energy?
the ability to move an object over distance
electrical energy
the energy associated with electrical currents
what causes the loops of wire and the pointer to move in a galvanometer?
the magnetic field.
in a galvanometer, what does the amount of rotation of the loops of wire and the pointer depend on?
the strength of the current
large generators use armatures similar to those in a motor
true
a transformer consists of
two separate coils of insulated wire wrapped around an iron core.
