| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.46 |
| Score | 0% | 69% |
Which of the following will increase the magnetic field produced by the electric current in a wire?
construct the wire from insulative material |
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construct the wire from conductive material |
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wind the wire into a coil |
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wrap the wire around a ceramic core |
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.
A diode to an electronic circuit is like a _______________ to a city?
one-way street |
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parking lot |
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highway |
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traffic light |
A diode allows current to pass easily in one direction and blocks current in the other direction.
Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.
high, high |
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low, low |
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high, low |
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low, high |
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.
What is the potential difference in an electrical circuit a measure of?
the resistance at a specific location in the circuit |
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the load at a specific location in the circuit |
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the voltage at a specific location in the circuit |
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the current at a specific location in the circuit |
Electrons flow from an area of high concentration to an area of low concentration. A high voltage indicates a high concentration of electrons that creates a greater potential for electron flow than a low voltage. When applied to a load, voltage creates electricity and potential difference is the measure of voltage at a specific location in an electrical circuit.
Which of these materials is not a good conductor of electricity?
gold |
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copper |
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air |
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tin |
All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.