| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.73 |
| Score | 0% | 75% |
The hertz is a unit of measurement for:
energy |
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power |
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frequency |
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inductance |
The hertz is a unit of measurement for frequency.
A solid state device has which of the following characteristics?
made from a mix of conductive and insulative material |
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made entirely from conductive material |
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made entirely from semiconductor material |
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made entirely from insulative material |
The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.
Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.
high, low |
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low, low |
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low, high |
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high, 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.
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.
| 443 W | |
| 440 W | |
| 432 W | |
| 660 W |