Discussion
In a thyrite lightning arrester the resistance
Answer: D
In a thyrite arrester the resistance is high at low current and low at high current.
Thyrite is a silicon carbide material with a strongly non-linear voltage-current characteristic. At normal system voltage it offers a very high resistance and passes almost no current, so the line is not loaded. When a lightning surge raises the voltage, its resistance collapses and it passes the large surge current to earth, then recovers its high resistance once the voltage returns to normal.
The other options describe a resistance that rises with voltage, the opposite of what an arrester needs: a resistor that grew with the surge would block the discharge instead of passing it.
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