How to use "coils" in a sentence

"Heat coils embedded in the surface," Elliot said.

On each side of the gate, a nine-foot-high fence, angled outward at the top and strung with wickedly sharp coils of razor wire, stretched out of sight into the forest

If you haven't yet read The Eyes of Darkness, I am giving away nothing important in the story when I tell you that eventually, in a search for her lost son, Tina ventures into the High Sierras in winter, where she comes across a paved road, in the middle of the wilderness, that features heating coils under the pavement to prevent snow from sticking to it

The heating coils would probably have to maintain the road at about 38 to 40 degrees Fahrenheit to be sure that it remained free of snow and ice