You can make a generator (electricity) by moving a magnet back and
forth through copper coiled wire.
Electromagnets can be turned off and on.
Which is not a
way to make an electromagnet stronger
add more coils of wire put a iron core in the middle add water
Which of these
An electromagnet is a permanent magnet An electromagnet is a temporary magnet An electromagnet is always the same strength
2. What is static electricity?
Have you ever rubbed a balloon against your hair and watched
your hair grab onto the balloon as you pull it away? Is it
magic? Is it magnetic? No, it's static electricity.
It's a little like a magnet because, like a magnet, there are
positive and negative electrical charges that are pulling it.
Atoms usually have
an equal amount of protons and electrons, so there is a balance, but the interesting thing about
electrons is that they can move from one thing to another.
4. How do electrons move?
rub the balloon against your hair you are rubbing electrons from
your hair onto the balloon.
Since the atoms in your hair have
lost electrons, your hair has more protons than electrons, so
your hair will have a positive charge. The balloon now has
more electrons than protons, so it has a negative charge.
Remember that unlikes
( positive and negative) attract.
balloon atoms and the hair atoms attract or pull toward each other.
What do you think
would happen if you had two balloons that both have a negative charge?
Think about a magnet.
What happens if
you put two negative ends toward each other.
The balloons would do
nothing The balloons would attract The balloons would repel
More electrons means
a negative charge.
More protons means a
A positive and a
A positive and a
positive or a
negative and a negative repel.
7. Can you answer
If you want to shock
something with static electricity, you rub your feet across the carpet.
Why does rubbing your feet on the carpet cause you to shock something?