| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.32 |
| Score | 0% | 66% |
The valence shell of a conductor is how full of electrons?
half full |
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full |
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less than half full |
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more than half full |
Conductors are elements that allow electrons to flow freely. Their valence shell is less than half full of electrons that are able to move easily from one atom to another.
The formula specifying Ohm's law is which of the following?
\(V = {R \over I}\) |
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V = I2R |
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\(V = {I \over R}\) |
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V = IR |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
| -1.5 A | |
| 7 A | |
| 10.5 A | |
| 3.5 A |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for current, I = \( \frac{V}{R} \) = \( \frac{175}{50} \) = 3.5 A
The ohm is a unit of measurement for:
resistance |
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power |
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capacitance |
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energy |
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.
Which of the following is not true about a line drop?
it is addressed by raising current and lowering voltage across the ransmission line |
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it is a decrease in voltage between two points on a line |
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it is addressed by raising voltage and lowering current across the transmission line |
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it is caused by resistance |
Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. A line drop is a decrease in voltage between two points on an electrical transmission line due to resistance in the line. A lower current and higher voltage across the line will help compensate for the line drop.