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例:電磁感應與變壓器[99學測]

下列關於圖中變壓器各部分的敘述,何者正確?

(A)電源用於提供主線圈電流以產生磁場,可用交流電或直流電
(B)主線圈是磁場的主要來源,相同電流時,匝數愈多,造成磁場愈強
(C)磁場造成的磁力線,其方向固定不變,數目隨磁場強度而定
(D)副線圈的匝數增加時,輸出的電壓值下降
(E)用來纏繞線圈的鐵心,也可以用塑膠取代

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Posted in 歷屆學測(推甄)考題, 變壓器, 電磁感應.

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