供电电极是指在地面、井中或坑道进行电法工作时，为了向地下供电而选用的连接电源的接地电极。
传感器基板包括：至少一个供电电极，向电 路非接触地提供检查信号；
The sensor substrate includes: at least a corrent electrode, supplying the detected signal to the circuit disconnectedly;
供电电极的接触电阻与大地的电阻率成正比，与电极的粗细及入土深度有关。
The contact electric resistance of the power supply electrode is in direct proportion to earth electric resistance rate, and in relation to the diameter of the electrode and the depth of the earth.
因为电池能存储的总能量依赖于它电极的体积，一个小的电池是不能长时间供电的。
The amount of energy a battery can store depends on the volume of its electrodes, so a thin battery does not last long.
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