| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.75 |
| Score | 0% | 75% |
The formula specifying Ohm's law is which of the following?
\(V = {R \over I}\) |
|
V = IR |
|
\(V = {I \over R}\) |
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V = I2R |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
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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empty |
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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.
The ampere is a unit of measurement for:
energy |
|
current |
|
power |
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inductance |
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 these materials is not a good conductor of electricity?
gold |
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copper |
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air |
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tin |
All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.
Longer the electrical wires mean _______________ voltage drop.
complete |
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diminishing |
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greater |
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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.