Question | Answer |
This happens when positive and negative charges no longer balance. Give an example of it. | Static electricity.
Example- Lightning. |
How is lightning formed?
a) when the particles in a storm cloud are neutral
b.) when positive particles form near the top of the clouds and negative particles form near the bottom of the clouds.
c.) When positive particles form near the top and bottom. | B.when positive particles form near the top of the clouds and negative particles form near the bottom of the clouds. |
Materials made up of atoms that become charged more easily than others. Electric passes fast. Give an example. | Conductors. Copper & Silver. |
Materials are made of atoms that do not become charged easily. Electric charge moves slowly through them. Give example. | Insulators. plastic, wood, glass |
Negative and Positive
a) repel
b) Attract | B. Attract |
Negative and Negative; Positive and Positive
A) repel
B)attract | A. Repel |
The invisible field around a magnet is the magnet's.. | Magnetic Field |
This helps converts electric energy to magnetic energy to mechanical energy | Electromagnets |
Electromagnets in doorbells | 2. Transformer- Controls current sent to electromagnet
3. Electromagnet- Electricity flows to wire and magnetizes the electromagnet
4. Contact Arm- pulls up
5. Bell |
How do you make electromagnets stronger? | More coiled loops of wire, wrapping around a iron core, larger core makes it stronger. |
The compass cannot be close to a ... | Magnet |
If no magnet is near the compass which way does it point? | North |
His discovery led to the first electric motor | Michael Faraday |
Name the inventor who produced a current by changing a magnetic field. | Michael Faraday and Joseph Henry |
What happens when a magnet breaks? | It become two magnets with a north and south pole. |
In a _________, electrical current flows in one path only | Series circuit |
In a _________, electrical current has two or more paths to follow. | Parallel circuit |