Resistance

Resistance:it is the property of a substance which opposes the flow of current through it 

Unit:ohm

Measurement: it is measured by voltmeter-ammeter method by comparison method by wheatstone bridge and directly by means of ohmmeter

Avometer:it is also known as multimeter and can be used to measure current voltage and resistance in amps,volts and ohm respectively 

Symbol:it,s symbol is "R"

One ohm:if a potential difference of one volt is applied to any resistance and it allows one ampere current to flow then the value of the resistance is one ohm. 

Other units of resistance:

1.micro ohm 

2.milli ohm

3.mega ohm 

4.kilo ohm