The lamp is loaded with an alternating voltage, which has the igniting frequency.

最 终将具有该点火频率的交流电压施加给灯。

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This bar naturally vibrates at 3.145 MHz, but apply an alternating voltage and it vibrates more quickly or slowly.

这种硅条自然的震动于3.145 MHz的频率，不过当施加一个交变电流的时候，它的震动会变快或变慢。

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Individual brain processes generate 'waves' of alternating voltage which can be measured on the scalp by an electro-encephalograph.

个体大脑运动过程中产生的交叉电压“微波”可在头皮上被脑电图仪测量。

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Their job is to convert high-voltage alternating current from the mains into low-voltage direct current for mobile phones, laptops, iPods and other electronic gadgets.

ECONOMIST: How a boring gadget saved $2 billion-worth of electricity

Large-scale electricity transmission usually uses alternating current, in which both current and voltage oscillate.

ECONOMIST: Superconductors are starting to become useful

High-voltage DC can carry power over long distances at lower cost than alternating current, but the transformers still cost too much to make the idea widespread.

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