Roof water resistance is your roof's resistance to rain where waterproof asphalt felt is the actual waterproof material.
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On Circuit Resistance = Close to the total load Resistance. Off Circuit Resistance = Near Infinitive High Resistance.
Internal resistance
Asphalt shingles typically last between and 15 and 30 years. It varies depending on the quality of your asphalt shingles
insulation resistance can be measured by means of megger, with built in d.c generator. It is measured between the conductor and the earth. earth resistance can be measured by means of earth resistance tester. For good effective earthing, th earth resistance should be of order 0.5 ohm
ohms is the unit of resistance while volts is the unit of voltage