Question about the current through a strong insulator

[abdossamad2003]

Suppose we put a strong insulator under our feet. In this case, when we connect the test light to the electrical outlet, the light of the test light lights turn on. I wonder how the electric current can pass through the strong insulator. If we calculate, the electric current cannot be more than 10^-18 amp which cannot turn on the test light lamp in any way.

 

[Baluncore]

I wonder how the electric current can pass through the strong insulator.

The current that flows is AC at the mains frequency. The small current needed to light the test light passes through the capacitance between your body and the nearby ground.

A thick sheet of good insulator will also conduct current across the hygroscopic dirty surface and around the edges of the sheet to ground.

Edit; Do the numbers.
Assume a minimum of 100 pF of body capacitance, 50 Hz, 230 Vrms.
Vpp = 2.8 * 230 = 650 volts slew in about 10 ms.
C = q/v = i·t/v ; i·t = c·v ; i = c·v/t
Average current; 100e-12 * 650 / 0.01 = 6.5 uA

 

[berkeman]

Suppose we put a strong insulator under our feet. In this case, when we connect the test light to the electrical outlet, the light of the test light lights turn on.

I'm confused by your question and situation. By "test light", do you mean an isolated AC Mains Safety Detection Device? If so, the answer given by @Baluncore is correct.

https://www.walmart.com/ip/Fluke-FLK2AC-90-1000V-90-1000-VAC-Detector/102480670