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18 Cards in this Set
- Front
- Back
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What term is used for electricity at rest? |
Electrostatics |
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Why does the gravitational force between Earth and the Moon predominate over electrical forces? |
Because there is no electrical force |
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Which part of an atom is positively charged, and which part is negatively charged? |
Protons are positively charged and electrons are negatively charged |
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How does the charge of one electron compared with the charge of another electron? |
The charge of one electron is the same compared to another electron. |
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What is most commonly the net charge of an atom? |
Zero net charge |
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What is the positive and negative ion? |
A positive ion has a net positive charge and a negative ion, an atom with one or more extra electrons, and negatively charged. |
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What is meant by conservation of charge? |
Whenever something is charged, no electrons are created or destroyed. Electrons are simply transferred from one material to another. |
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Name one particle that has exactly one Quantum the unit of charge. |
An electron (or proton) has exactly one Quantum unit of charge. |
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How does one coulomb of charge compare with the charge of a single electron? |
One coulomb is the charge associated with 6.25 billion electrons. |
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Why are materials such as glass and rubber good insulators? |
Atoms of insulators are poor conductors because of their strong hold on their electrons. |
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What is the transitor composed of, and what are some of its functions? |
A transitor is composed of thin layers of semiconducting materials. Its functions include controlling the flow of electrons, amplifying signals, and acting as a switch |
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What happens to electrons in any charging process? |
Electrons are transferred from one place to another. |
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What kind of charging occurs during thunderstorms? |
Charging by induction occurs during thunderstorms. |
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In terms of net charge, how does an electrically polarized object differ from an electrically charged object? |
Unlike a charged object, a polarized object may have no net charge. |
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Give an example of a common electric dipole. |
H2O is an electric dipole. |
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How is the direction of an electric field defined? |
The direction of an electric field is the direction of force on a positive charge. |
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When charges mutually repel and distribute themselves on the surface of conductors, what becomes of the electric field inside a conductor? |
The electric field inside a conductor cancels to zero. |
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A balloon made easily be charged to several thousand volts. Does that mean it has several thousand joules of energy? Explain. |
No. Several thousand volts is different from the ratio several thousand volts per coulomb. Voltage is measured in volts; voltage / coulomb is energy and measured in joules. Several thousand joules per coulomb isn't much energy if you have a tiny fraction of the coulomb. |
