| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.20 |
| Score | 0% | 64% |
The hertz is a unit of measurement for:
energy |
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inductance |
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frequency |
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power |
The hertz is a unit of measurement for frequency.
An inductor __________ changes in the electric current flowing through it.
enhances |
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doubles |
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resists |
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eliminates |
An inductor is coiled wire that stores electric energy in the form of magnetic energy and resists changes in the electric current flowing through it. If current is increasing, the inductor produces a voltage that slows the increase and, if current is decreasing, the magnetic energy in the coil opposes the decrease to keep the current flowing longer. In contrast to capacitors, inductors allow DC to pass easily but resist the flow of AC.
The valence shell of a semiconductor is how full of electrons?
half full |
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more than half full |
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empty |
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less than half full |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.
An engineer who wants to document an electric circuit would create which of the following?
a blueprint |
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a schematic |
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a layout |
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a matrix |
A schematic is the proper name for a drawing of an electric or electronic circuit.
Which of the following is not true about a line drop?
it is addressed by raising current and lowering voltage across the ransmission line |
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it is caused by resistance |
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it is addressed by raising voltage and lowering current across the transmission line |
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it is a decrease in voltage between two points on a line |
Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. A line drop is a decrease in voltage between two points on an electrical transmission line due to resistance in the line. A lower current and higher voltage across the line will help compensate for the line drop.