单项选择题

In a series circuit, which value will remain unchanged at all places in the circuit?（）

A.Voltage
B.Current
C.Resistance
D.Inductance

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单项选择题

Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.

A.increase in resistance with increased temperature
B.increase in resistance with decreased temperature
C.decrease in resistance with increased temperature
D.increase in conductance with increased temperature

单项选择题

The function of a rectifier is similar to that of a （）.

A.trap
B.regulating valve
C.check valve
D.filter

单项选择题

Electrical circuits are protected against overheating by means of a/an （）.

A.circuit breaker
B.amplifier
C.diode
D.capacitor