| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
The valence shell of a semiconductor is how full of electrons?
more than half full |
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empty |
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half full |
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less than half full |
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.
A diode to an electronic circuit is like a _______________ to a city?
highway |
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parking lot |
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traffic light |
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one-way street |
A diode allows current to pass easily in one direction and blocks current in the other direction.
From what energy do photovoltaic cells produce electrical energy?
nuclear |
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chemical |
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sun |
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magnetic |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Voltage and current are __________ proportional.
inversely |
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indirectly |
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directly |
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not |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
This circuit diagram represents a(n):
series circuit |
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series-parallel circuit |
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open circuit |
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parallel circuit |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.