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23 Cards in this Set
- Front
- Back
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What is the major difference between static electricity and current electricity? |
Current electricity involves a flow of electrons; static electricity involves a single transfer ofelectrons |
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What is static electricity caused by? |
An imbalance of positive and negative charges |
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If a substance has an excess number of electrons on its surface, what type of chargedoes it have? |
A negative charge |
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Which of the following atoms is considered neutral? |
An atom with five protons, six neutrons, and five electrons |
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How are electrons different from protons and neutrons? |
Protons and neutrons exist inside atomic nuclei; electrons orbit atomic nuclei |
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What can you infer about any object that gives you a static shock when you touch it? |
It's a conductor |
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What happens when you touch a metal doorknob after rubbing your shoes on thecarpet? |
Millions of electrons go from your finger into the doorknob |
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Lightning is a form of static electricity. What can you infer about what happens whenlightning strikes the ground? |
An electric current is established between the clouds and the ground |
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How does alternating current differ from direct current? |
Direct current always flows in the same direction; the direction of an alternating currentswitches back and forth |
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How does electricity travel from power plants to your house? |
Through transmission wires |
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What is the function of every generator on Earth? |
Changing mechanical energy into electrical energy |
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What are electrons? |
Negatively charged subatomic particles |
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What is a current? |
A steady flow of electricity |
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What device opens and closes an electric circuit? |
A switch |
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A flow of electrons through a conductor is called: |
A current |
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What happens when electricity flows through an object? |
A magnetic field is created |
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What are the two poles of a magnet called? |
North and south |
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What is a common energy source for a circuit? |
A battery |
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What effect will the north pole of one magnet have on the north pole of anothermagnet? |
Repulsive |
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Which of the following is a true statement? |
Faraday built on Orsted's discoveries to describe electromagnetic induction |
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When an electric current runs through a wire, a magnetic field is induced |
Around the wire |
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What is the relationship between electricity and magnetism? Choose the best answer. |
They are two forms of the same basic force |
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What might happen if transformers didn't exist? |
The electricity in your house might have an extremely high voltage |
