Ohms are the standard unit of electrical resistance, named after German physicist Georg Ohm. The symbol is the Greek letter omega (Ω). In grounding sheet contexts, ohms measure how much a material resists the flow of electrical current, which directly affects how effectively the sheet conducts your body's induced charge to earth.
A multimeter set to ohms measures resistance between two probes. Lower values mean better conductivity. Higher values mean worse conductivity, eventually reaching the point where current can't flow effectively.
Typical resistance values for grounding sheets:
A new silver-fiber grounding sheet measures 2-5 ohms across the conductive surface (corner to snap connector).
A new stainless steel or carbon-fiber sheet measures 5-15 ohms, slightly higher than silver because the base materials have higher resistance.
A well-maintained sheet at 12 months reads 5-10 ohms (silver) or 8-18 ohms (stainless or carbon).
A degraded sheet that's lost meaningful conductivity reads above 25 ohms across the surface, with complete failure at 50+ ohms.
The functional cutoff for a working grounding sheet is around 25 ohms across the conductive surface. Above this level, the sheet still conducts some current but the grounding effectiveness is significantly reduced.
For ground rod installations, the target resistance from the rod to absolute earth is under 25 ohms, with under 10 ohms preferred. This is measured with specialized equipment by electricians, not the multimeter you'd use to test a sheet.
Inline safety resistors in grounding cords are 100,000 ohms (100 kΩ), which is high enough to limit current flow in fault conditions while low enough to allow normal grounding function.
Related terms: multimeter, conductive thread, inline resistor.
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