单选题
发布日期:2021-03-22
过坐标轴零点的直线
过坐标轴零点,I随U按指数规律变化的曲线
正向电压超过某一数值后才有电流的直线
正向电压超过某一数值后I随U按指数规律变化的曲线
半导体二极管是指利用半导体特性的两端电子器件。最常见的半导体二极管是PN结型二极管和金属半导体接触二极管。它们的共同特点是伏安特性的不对称性,即电流沿其一个方向呈现良好的导电性,而在相反方向呈现高阻特性。可用作为整流、检波、稳压、恒流、变容、开关、发光及光电转换等。利用高掺杂PN结中载流子的隧道效应可制成超高频放大或超高速开关的隧道二极管。
伏安是电气测量的一种单位,等于一个单位的伏特和一个单位的安培之间的乘积,在直流电中作为功率的量度,在交流电中作为表现功率的量度。
中文名称 正向英文名称 forwarddirection,conductingdirection
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