resistor
objects that resist the flow of electric current
electromagnetic
a magnet formed when electric current flows through wire, wrapped din coils around an iron bar
motor
a device that changes electricity to other forms of energy into mechanical energy
generator
a device that produces alternating current by spinning an electric coil between the poles of a magnet; changes motion into electrical energy
What does a resistor do?
objects that assist the flow of electric current
What does an electric motor do?
it changes electrical energy into motion
What is mechanical energy?
the energy of moving parts in a machine
What are the three parts of an electric motor?
magnet, shaft, loop of wire attached to an electricity source
What is the difference between alternating current and direct current?
alternating current flows in one direction and the flows in the opposite direction; direct current only flows in one direction
What is voltage and how is it measured?
is the strength of a power source and measured in volts
After an electric current leaves the power plant, the voltage is increased. Why?
to prevent the loss of power
After the electric current is increased, it is then decreased before it reaches the place where it is to be used. Why?
so that it is at a safe level for home use
What is a transformer?
changes the voltage of electric current