This supplies 5 volts to pin 13. That creates a voltage difference across the pins of the LED, and lights it up.
这为13脚提供了5伏的电压，正是这个电压使LED灯亮。
In the case of lead and lead dioxide, this potential difference is just over two volts per cell.
以铅和二氧化铅为例的电池，每节电池的电位差可产生2伏电压。
The resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is following.
已知导线中流过的电流，只要测出导线两端电位差的伏特值，就能很容易得出任何长度导线的电阻值。
The resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is following.
已知导线中流过的电流，只要测出导线两端电位差的福特值，就能很容易得出任何长度导线的电阻值。
Thee resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is following.
已知导线中流过的电流，只要测出导线两端电位差的福特值，就能很容易得出任何长度导线的电阻值。
In fact, you can bet that no two sources that are connected to the earth ground are at the same reference level; the difference between them could easily be up to 10 volts.
事实上，你可以试验一下，两个拥有相同参照物而非同时接地的电源，它们之间的电压差异很可能只有10v左右。
In fact, you can bet that no two sources that are connected to the earth ground are at the same reference level; the difference between them could easily be up to 10 volts.
事实上，你可以试验一下，两个拥有相同参照物而非同时接地的电源，它们之间的电压差异很可能只有10v左右。
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