Particulate Nature of Matter B.5 Electric Circuits (id: 9ca5e9b3a)

本题目来源于试卷: Particulate Nature of Matter B.5 Electric Circuits，类别为 IB物理学

[单选题]
The following graph shows the relationship between current and potential difference across an unknown component in a series circuit.


Which of the following is true about the component?

A. The component is not a resistor.
B. The component is made of non-conducting material.
C. The component is a non-ohmic resistor.
D. The component is an ohmic resistor.


参考答案:  C


本题详细解析:
Explanation:

$A$.All electrical components are resistors to some extent. Even the best conductors will take up some amount of energy as electricity flows through them.

$B$.While all materials are conducting given the appropriate voltage, at voltages as low as those shown on the graph, no current would flow if the material was not a good conductor of electricity.

$C$.According to the graph, the ratio $V$/$I$ is not constant. By definition, that indicates a non-ohmic resistor. C is the correct answer.

$D$.The voltage-current graph of an ohmic resistor is a straight line whose gradient represents a constant resistance.

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