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| 21. | measures electrostatic voltage differences; draws no current from the source. |
| 测量静电电压的差异；没有电流通过。 |
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| 22. | Iron can be magnetized by passing an electric current round it. |
| 让电流通过铁能使铁磁化。 |
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| 23. | The current to be measured enters the coil through the wire . |
| 要被测量的电流通过电线进入线圈。 |
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| 24. | When an electric current passes through the liquid, the crystals align, preventing light from passing through. |
| 当电流通过液体时，晶体就排列起来，阻挡光线通过。 |
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| 25. | Then they run pulses of current through the wire. |
| 然后，研究人员往电线上通过一阵阵电流。 |
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| 26. | These impurities affect the way electric current moves through the silicon. |
| 这些杂质能影响通过硅的电流。 |
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| 27. | Circuit A circuit is a path for an electric current across a potential( voltage). |
| 电路电路是电流通过电势（压）路径。 |
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| 28. | Electricity flows through a wire just as water flows through a pipe. |
| 电流通过导线，像水流过水管一样。 |
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| 29. | To produce(an electric current or a magnetic charge) by induction. |
| 感应通过感应而产生（电流或电磁） |
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| 30. | To link(two circuits or currents)as by magnetic induction. |
| 连接如通过电磁感应连接（两条线路或电流） |
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