單項選擇題

The resistance of electric wire will decrease as its （）

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

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The total power consumed in a parallel circuit is （）

A.the sum of the powers used in each load (resistor)
B.divided by the number of loads
C.always less than the power used in the smallest load
D.the sum of the powers used in each individual load never more than the power used in the largest load

單項選擇題

Current measuring instruments must always be connected in （）

A.series with a circuit
B.parallel with a circuit
C.series-parallel with a circuit
D.delta with the shunt