| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.26 |
| Score | 0% | 65% |
The rate of flow of electrons per unit time is which of the following?
current |
|
resistance |
|
voltage |
|
conductance |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
The valence shell of a semiconductor is how full of electrons?
less than half full |
|
more than half full |
|
half full |
|
empty |
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.
What is the voltage of most household electrical systems in the United States?
60Hz |
|
110V |
|
220V |
|
60V |
Most households use electricity with a voltage of 110V.
The conductivity of an element depends on how many electrons occupy which electron shell?
inner |
|
first |
|
outer |
|
middle |
All electricity is the movement of electrons which are subatomic particles that orbit the nucleus of an atom. Electrons occupy various energy levels called shells and how well an element enables the flow of electrons depends on how many electrons occupy its outer (valence) electron shell.
| 60V 60A | |
| 15V 120A | |
| 120V 120A | |
| 120V 15A |
Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 120V 15A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yielding a 15V 120A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 60V 60A configuration.