| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.38 |
| Score | 0% | 68% |
The valence shell of a semiconductor is how full of electrons?
empty |
|
half full |
|
more than 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.
Longer the electrical wires mean _______________ voltage drop.
complete |
|
greater |
|
diminishing |
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lesser |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
If an electrical circuit is interrupted, which of the following will result?
open circuit |
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closed circuit |
|
parallel circuit |
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short circuit |
A closed circuit is a complete loop or path that electricity follows. It consists of a source of voltage, a load, and connective conductors. If the circuit is interrupted, if a wire is disconnected or cut for example, it becomes an open circuit and no electricity will flow.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
negative, negative |
|
positive, negative |
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negative, positive |
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positive, positive |
Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.
Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.
high, high |
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low, high |
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high, low |
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low, low |
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.