| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
The conductivity of an element depends on how many electrons occupy which electron shell?
inner |
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middle |
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first |
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outer |
All electricity is the movement of electrons which are subatomic particles that orbit the nucleus of an atom. Electrons occupy various energy levels called shells and how well an element enables the flow of electrons depends on how many electrons occupy its outer (valence) electron shell.
The volt is a unit of measurement for:
current |
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power |
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capacitance |
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voltage |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Which of the following will increase the magnetic field produced by the electric current in a wire?
wind the wire into a coil |
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construct the wire from conductive material |
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wrap the wire around a ceramic core |
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construct the wire from insulative material |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.
low, high |
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high, high |
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low, low |
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high, low |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
| 120V 400A | |
| 6V 200A | |
| 60V 20A | |
| 30V 100A |
Connecting the 10 batteries in series multiplies their voltage while keeping their current the same yielding a 60V 20A configuration. Connecting the 10 batteries in parallel multiplies their current while keeping their voltage the same yielding a 6V 200A configuration. Using a series-parallel connection, 5 batteries can be connected in series and 5 can be connected in parallel resulting in a 30V 100A configuration.