Lesson 3
anything that pulls iron, steel, and certain other metals to it
The earth's magnetism makes it possible for people to find directions using a _____.
compass
The northern lights and the southern lights are lights in the sky caused by the earth's ____ ____.
magnetic field
In a series circuit, there is only ____ path for the electric current to flow.
one
a material through which electric current passes easily (example: copper)
conductor
the force around a magnet
magnetism
When like/unlike poles of two magnets are near each other, the poles push apart or repel
like
a circuit that connects several objects one after another so that the current flows in a single path
series circuit
If one item in a series circuit goes out, the electric current cannot flow. The circuit becomes and ______ circuit. Many Christmas tree lights produced years ago and most flashlights contain series circuits.
open
a material though which electric current does not pass easily (example: rubber)
insulate
the space around a magnet where magnetism acts
magnetic field
When like/unlike poles of two magnets are near each other, the poles pull together, or attract.
unlike
a circuit that connects several objects in a way that the current for each object has its own path
parallel circuit
In a _______ circuit, there is one more than one path along which an electric current can flow.
parallel
Matter is made up of _____.
atoms
a small magnet that can turn freely
compass
________ are natural magnets.
Lodestone
______ _______ is the flow of electricity through matter.
electric current
If an item in a parallel circuit goes out, the electric current can still flow along other paths. The circuit stays ________. Most of the Christmas tree lights produced today and most circuits used in homes are parallel circuits.
closed
Atoms are made of smaller bits of matter called _______, ________, and ________.
neutrons
electrons
protons
a place on a magnet where magnetism is strongest
pole
A _____ _______ is small ,magnet that can turn freely. It will align with the earth's magnetic field. One end points north and the other end other points south.
compass needle
There are two basic types of circuits: _____ circuits and _____ circuits.
series
parrallel
a measure of how much materials opposes the flow of electric current and changes electric current into heat energy
resistance
________ have a positive charge.
protons