You can get a spark when air changes from an electricalinsulator into an electrical conductor.
2
Looking at it closely, Wheeler came to the conclusion that it was some kind of electricalinsulator.
3
To function as an electricalinsulator, myelin is generated as a tightly packed, lipid-rich multilayered membrane sheath.
4
If there were no electrons in the conduction band, the material would act as an electricalinsulator.
5
It was more than a question of finding the perfect electricalinsulator, though that would be handy too.
6
The electrical tape achieves the same result at a much lower cost, by putting an electricalinsulator between you and the phone's antenna.
7
The glass cylinder reminded many of an electricalinsulator, a showy way of pointing out that the figure was perfectly isolated on the stage.
8
For these waves, as we have seen, the most transparent bodies are the most perfect electricalinsulators; while bodies still slightly conducting are entirely opaque.
9
There are magnets that are nonmetallic-thatis, they are electricalinsulators, but still generate a large magnetic field-anddevices called "top-hat transistors" do indeed exist.