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What is physics?                   

The study of matter ,energy and their mutual relationship is called physics.

Until 20th century it was believed that the study of matter and energy is known as physics but later on einstien in 1905 came up with a theory which i.e special theory of relativity which is well known today which says that if any particle moves with the speed of light it will be totally converted into energy which is not possible because no particle can acheive  the speed of light and that is known as mutual relationship 

             faradayeinstien.blogspot.com

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 

Impedance unit