| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
An inductor __________ changes in the electric current flowing through it.
doubles |
|
resists |
|
enhances |
|
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.
An engineer who wants to document an electric circuit would create which of the following?
a blueprint |
|
a matrix |
|
a layout |
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a schematic |
A schematic is the proper name for a drawing of an electric or electronic circuit.
The valence shell of n insulator is how full of electrons?
empty |
|
more than half full |
|
less than half full |
|
half full |
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.
Which of the following will increase the magnetic field produced by the electric current in a wire?
wind the wire into a coil |
|
wrap the wire around a ceramic core |
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construct the wire from insulative material |
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construct the wire from conductive 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.
In metals, increasing the temperature typically _____________ conductivity.
increases |
|
does nothing to |
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decreases |
|
eliminates |
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.