| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.24 |
| Score | 0% | 65% |
Why is an insulator a poor conductor of electricity?
an insulator has few free electrons |
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an insulator is made of inorganic material |
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an insulator is made of organic material |
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an insulator has many free electrons |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
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one-way street |
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highway |
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parking lot |
A diode allows current to pass easily in one direction and blocks current in the other direction.
| 1201.5 W | |
| 1200 W | |
| 1206 W | |
| 400 W |
In metals, increasing the temperature typically _____________ conductivity.
does nothing to |
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decreases |
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eliminates |
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increases |
All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.
Which of the following allows DC to pass easily but resists the flow of AC?
semiconductor |
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transformer |
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inductor |
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capacitor |
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.