That means obstacle or resistance

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That means obstacle or resistance



                                 

           
                   The characteristic of the conductor or substance to obstruct the flow of electricity from any object or carrier is called its barrier. It comes from the symbol R. and its unit is ohm. Ohm meter is used to measure it. The ohms meter is never connected to the supply; it is attached to the two ends of the ohmeter over the two ends of the instrument which is to measure the resistance.

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