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.abdossamad2003 said:
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.abdossamad2003 said:
When a strong insulator is subjected to a high voltage, it generally does not conduct electricity. However, if the voltage is high enough to exceed the material's breakdown voltage, the insulator can become conductive, leading to an electrical breakdown or failure.
Under normal conditions, a strong insulator does not allow current to flow through it. Insulators have a very high resistance, which prevents the movement of charge carriers, effectively blocking the flow of electrical current.
Materials such as rubber, glass, ceramics, and certain plastics are considered strong insulators. These materials have high resistance and low electrical conductivity, making them effective at preventing the flow of electric current.
Temperature can affect the insulating properties of a strong insulator. Generally, as temperature increases, the resistance of an insulator decreases, which can lead to a slight increase in conductivity. However, if the temperature becomes too high, it can cause the material to degrade or even melt, significantly reducing its insulating effectiveness.
The breakdown voltage of an insulator is the minimum voltage that causes the insulator to become conductive. It is important because it defines the maximum electrical stress that the insulator can withstand without failing. Knowing the breakdown voltage helps in designing electrical systems to ensure they operate safely within the limits of the insulating materials used.