| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?
zener diode |
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v-type diode |
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light emitting diode |
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standard diode |
A diode allows current to pass easily in one direction and blocks current in the other direction. A zener diode is a diode which allows current to flow in one direction as normal and will also allow current flow in the reverse direction when the voltage is above a certain value. This value is called the breakdown voltage.
Which of the following is not a characteristic of a step-up transformer?
the primary voltage is higher than the secondary voltage |
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has more turns in the secondary winding than in the primary winding |
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increases voltage |
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the secondary voltage is higher than the primary 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.
From what energy do photovoltaic cells produce electrical energy?
sun |
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magnetic |
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nuclear |
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chemical |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
The valence shell of a conductor is how full of electrons?
more than half full |
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half full |
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full |
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less 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.
| 1345 W | |
| 1350 W | |
| 4050 W | |
| 1485 W |