| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
Longer the electrical wires mean _______________ voltage drop.
complete |
|
greater |
|
diminishing |
|
lesser |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
This circuit component symbol represents a(n):
transistor |
|
AC source |
|
DC source |
|
transformer |
In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.
Which of these materials is not a good conductor of electricity?
copper |
|
tin |
|
gold |
|
air |
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.
What is the voltage of most household electrical systems in the United States?
110V |
|
60V |
|
60Hz |
|
220V |
Most households use electricity with a voltage of 110V.
The valence shell of a semiconductor is how full of electrons?
empty |
|
less than half full |
|
more than half full |
|
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.