Random
The movement of electrically charged particles is called a(n) ________ _______.
electric current
A temporary magnet made with a current-carrying wire coil wrapped around a magnetic core is called an _____________.
electromagnet
What is a device that uses an electric motor?
answers vary
An electric generator converts __________ energy into ________ energy.
mechanical, electrical
________________ is the interaction between electric charges and magnets.
electromagnetism
Electric current can only flow in a ______ circuit.
closed
As the electric current through a wire increases, the magnetic field around the wire becomes ________.
stronger
An electric motor converts ________ energy into __________ energy.
electrical, mechanical
Which type of current flows in only one direction?
direct current
What surrounds an electric current?
magnetic field
What tool is used to measure voltage?
voltmeter
As the amount of coils in a wire decreases, the magnetic field around the wire becomes ________.
What are the two forces that cause an electric motor to rotate?
attraction/repulsion
Which type of current changes direction in a regular pattern?
alternating current
What angle do the electric current and magnetic field make?
90 degrees (perpendicular)
What tool is used to measure current?
ammeter
True or False: The poles of an electromagnet stay the same even if the direction of the current is reversed.
false
Which part of an electric motor reverses the current in the coil?
commutator
What kind of current does a generator produce?
alternating current
For a magnet inside a wire loop to produce an electric current, the magnet must be ______.
moving
How many milliamps (mA) are in an amp (A)?
1000
True or False: An electromagnet is a current-carrying wire wrapped around a copper core.
What are the four parts of an electric motor?
battery, commutator, wire coil, permanent magnet
Where does a hand-crank generator get energy from?
the motion of our hand
True or False: Current will not flow through a wire if the magnet is outside the coil.
false