| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.60 |
| Score | 0% | 72% |
The rate of flow of electrons per unit time is which of the following?
current |
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resistance |
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voltage |
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conductance |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
Which of the following can conduct electricity under some conditions but not others?
conductor |
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semiconductor |
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insulator |
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resistor |
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.
The valence shell of a semiconductor is how full of electrons?
half full |
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more than half full |
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less than half full |
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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.
Which of the following is not a purpose of a resistor in an electrical circuit?
control the voltage in the circuit |
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limit the current in the circuit |
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multiply the current in the circuit |
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moderate the heat in the circuit |
Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.
The joule is a unit of measurement for:
energy |
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capacitance |
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power |
|
resistance |
The joule is a unit of measurement for energy.