| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
The rate of flow of electrons per unit time is which of the following?
resistance |
|
voltage |
|
conductance |
|
current |
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.
One of the lights on your Christmas tree burns out and this causes the rest of the lights connected to that strand to go dark. How are the lights in that strand connected?
series-parallel |
|
series |
|
perpendicular |
|
parallel |
Lights connected in series form a chain with each light connecting to adjacent lights via one wire. Therefore, if one of the lights burns out and breaks the series, none of the other lights will receive power and they'll go dark. Lights connected in parallel each connect to the positive and negative nodes of the power source and would not go dark if one of their neighbors burnt out.
What is the frequency of most household electrical systems?
110Hz |
|
60Hz |
|
60MHz |
|
110V |
Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. Most households use electricity with a frequency of 60Hz.
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the slower electron flow will be |
|
the more resistive the conductor is the faster electron flow will be |
|
the less resistive the conductor is the slower electron flow will be |
|
electrically conductive materials have no resistive properties |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
moving |
|
high voltage |
|
low voltage |
|
stationary |
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.