Lesson 1
an excess of positive or negative charge in an object
static electricity
a material through which an electric charge can move easily
conductor
a thin coiled resistor that transforms electrical energy into light energy and heat
filament
space around a magnet in which magnetic forces operate
a device that uses electromagnets to change electrical energy into mechanical energy
motor
a property of matter that can be described as positive or negative
electric charge
a material through which an electric charge moves slowly
insulator
a force that acts when two surfaces rub together
friction
a force that acts on moving electric charges and magnetic materials
magnetism
a machine that produces electrical energy by turning coils of wire around powerful magnets
generator
the push or pull between two charged objects
electric force
an electric charge in motion
electric current
an object that uses the energy in a circuit
resistor
the ends of a magnet
magnetic poles
a magnet that only works when electricity is provided
electromagnet
electric charge can flow in only one circular path
series circuit
it has two or more paths through which electric charges may flow
parallel circuit