Simply magnetise a spot or, more usefully, many spots, and the spots' status can be detected by measuring the changes they induce in the electrical resistance of a tiny sensor placed nearby.
其方法很简单, 只要对一个点或多个点进行磁化以发挥更大的功效, 然后在其附近放置一个微小的传感器就能检测到它们在电阻下的变化从而得知各点的状态.
The basic principle on electrical current measurement by electro-thermal conversion was enunciated and a kind of sensor which was made of electric wire and resistance was introduced.
阐述了采用电热转换方法测量电流的基本原理，介绍了利用电热带和热电阻构成的传感器。
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