交流电
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(交(jiāo )流(liú )电(diàn ),交(jiāo )流(liú )电(diàn ))
指(zhǐ )大(dà )小(xiǎo )和(hé )方(fāng )向(xiàng )随(suí )时(shí )间(jiān )作(zuò )周(zhōu )期(qī )性(xìng )变(biàn )化(huà )的(de )电(diàn )流(liú )。我(wǒ )国(guó )通(tōng )用(yòng )的(de )交(jiāo )流(liú )电(diàn )是(shì )五(wǔ )十(shí )赫(hè )兹(zī )正(zhèng )弦(xián )交(jiāo )流(liú )电(diàn ),即(jí )电(diàn )流(liú )按(àn )正(zhèng )弦(xián )波(bō )形(xíng )每(měi )秒(miǎo )钟(zhōng )周(zhōu )期(qī )性(xìng )变(biàn )化(huà )五(wǔ )十(shí )次(cì )。交(jiāo )流(liú )电(diàn )的(de )优(yōu )点(diǎn )是(shì )可(kě )以(yǐ )通(tōng )过(guò )变(biàn )压(yā )器(qì )按(àn )需(xū )要(yào )改(gǎi )变(biàn )电(diàn )压(yā )。
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