why armature resistance is very low as compare to field resistance in dc motor
resistance to current flowAn ohmmeter meassures resistance
Well u can use a digital meter and check resistance from end to end of each wire. The meter would read OL wich means an overload of resistance. Measuring voltage would be dangerous because u have to apply power. You do not use power when measuring resistance. But the process of measuring each wire may be time consuming. If you could find a schematic of the houses wiring it would help i isolating the exact wiring.
R = (density)(Length)/(Area) Unit of resistance is Ohms.
The arrow opposite the direction of travel is the air resistance or drag.
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Id try www.scribd.com
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To measure resistance, and to check continuity.
Usually you check mega-ohms by reading the resistance between compressor shell and the windings. There should be a large amount of resistance which means the windings are not shorted to the compressor case or shell. Use a DVM (digital volt ohm meter) to check the resistance.
Ideally megger test is the best test used to check the resistance of motor winding.
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Radio Shack dot com has many outdated equipment guides.
Get some resistors of known values and check your meter with them.
The best way is to check the data sheet and see if ESR (equivalent series resistance) is listed.
In an online/live plant, check if resistance is varying or if its showing max resistance or Overload, then RTD needs to be replaced.