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單項(xiàng)選擇題

The device that most commonly utilizes the principle of electromagnetic induction is the（）.

A.diode
B.transformer
C.transistor
D.rheostat

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單項(xiàng)選擇題

Which of the listed devices is used to measure pressure and convert it to an electrical signal?（）

A.Transducer
B.Reducer
C.Transformer
D.Rectifier

單項(xiàng)選擇題

A direct current passing through a wire coiled around a soft iron core is the description of a simple（）.

A.magnetic shield
B.electromagnet
C.piezoelectric device
D.electromagnetic domain