It measures resistance in a component or circuit to determine if there is a break in that circuit or component. If there's no resistance, it means there's a break, as no electrical current is passing through.
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To measure the resistance to current flow of a material or electrical/electronic device. Continuity testing.
Capacitance is measured in Farads. "The unit... in ohm and meter" does not make sense.
Ohm meter is basically a series combination of resistances and galvanometer and source of current .Used to determine unknown resistance.
ohmmeter has it's own power supply
I believe the ohm meter will read about 90% of the true ac impedance.
If you place an OHM meter across a resistor, it will read resistance. An OHM meter set to read voltage will read any voltage present. So, if you pick up a resistor, connect it to a volt meter, in theory, no voltage will be present. Unless you're feeding some sort of electricity through it. I'm certainly not an electrical engineer, I do however use a volt/ohm meter occasionally. A volt/ohm meter is a dual/multi purpose piece of equipment.