| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.05 |
| Score | 0% | 61% |
Resistance and current are __________ proportional.
directly |
|
inversely |
|
exponentially |
|
not |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.
What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?
light emitting diode |
|
v-type diode |
|
zener diode |
|
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.
The diameter of a number 12 wire is __________ the diameter of a number 6 wire?
less than |
|
double |
|
triple |
|
more than |
The larger the number the smaller the diameter of the wire. So, the diameter of a number 12 wire is less than the diameter of a number 6 wire.
The valence shell of a semiconductor is how full of electrons?
half full |
|
less than half full |
|
more than 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.
From what energy do photovoltaic cells produce electrical energy?
nuclear |
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sun |
|
chemical |
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magnetic |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.