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.
