| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.05 |
| Score | 0% | 61% |
Which of the following will help to prevent a short circuit?
fuse |
|
transistor |
|
diode |
|
resistor |
Fuses are thin wires that melt when the current in a circuit exceeds a preset amount. They help prevent short circuits from damaging circuit components when an unusually large current is applied to the circuit, either through component failure or spikes in applied voltage.
What is the voltage of most household electrical systems in the United States?
60V |
|
60Hz |
|
110V |
|
220V |
Most households use electricity with a voltage of 110V.
Which of the following is not a characteristic of a step-up transformer?
has more turns in the secondary winding than in the primary winding |
|
increases voltage |
|
the secondary voltage is higher than the primary voltage |
|
the primary voltage is higher than the secondary voltage |
As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.
The valence shell of a conductor is how full of electrons?
more than half full |
|
half full |
|
less than half full |
|
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.
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
|
parking lot |
|
highway |
|
one-way street |
A diode allows current to pass easily in one direction and blocks current in the other direction.