| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
Which of the following is a difference between a circuit breaker and a fuse?
all of these |
|
a circuit breaker can be reused |
|
a fuse responds more quickly than a circuit breaker |
|
a fuse is cheaper than a circuit breaker |
Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.
The valence shell of a conductor is how full of electrons?
full |
|
less than half full |
|
half full |
|
more than half full |
Conductors are elements that allow electrons to flow freely. Their valence shell is less than half full of electrons that are able to move easily from one atom to another.
Longer the electrical wires mean _______________ voltage drop.
diminishing |
|
complete |
|
lesser |
|
greater |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
moving |
|
stationary |
|
high voltage |
|
low voltage |
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.
The conductivity of an element depends on how many electrons occupy which electron shell?
outer |
|
first |
|
inner |
|
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.