单项选择题

An ammeter should be used to measure （）

A.the voltage between two points in a circuit
B.circuit continuity
C.current flow in a circuit
D.total or partial circuit resistance

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单项选择题

A.increases by the square of the original value
B.increases
C.remains the same
D.decreases

单项选择题

A.connected load
B.prime mover speed
C.field excitation
D.generators rated voltage

单项选择题

A.length increases
B.cross-sectional area increases
C.temperature increases
D.percent of metallic purities increases