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What is resistance and what is resistivity and what is difference between them and please explain in detail

Posted by Akshita Akshita 5 years, 3 months ago

2 answers

R Shiva Prasad Sharma 5 years, 3 months ago

Resistance is defined as the property of the conductor which opposes the flow of electric current. It is also defined as the ratio of the voltage applied to the electric current flowing through it. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. Sl. No. Differentiating Property Resistance Resistivity 1 Definition Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons. Resistivity is the physical property of a particular substance which is having particular dimensions. 2 Proportionality Resistance is directly proportional to the length and temperature while it is inversely proportional to the cross-sectional area of the material. Resistivity is only proportional to the nature and temperature of the particular material. 3 Symbol R ρ 4 Formula R = V/I or, R = ρ(L/A)V = Voltage, I = Current, ρ = Resistivity ρ = (R×A)/L R = Resistance, L= Length, A = Cross-sectional area 5 SI Units The SI unit of resistance is Ohms The SI unit of resistivity is Ohms-meter.

2Thank You

Yogita Ingle 5 years, 3 months ago

Resistance is defined as the property of the conductor which opposes the flow of electric current. It is also defined as the ratio of the voltage applied to the electric current flowing through it.

Resistivity is defined as the resistance offered by the material per unit length for unit cross-section.

Sl. No.	Differentiating Property	Resistance	Resistivity
1	Definition	Resistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons.	Resistivity is the physical property of a particular substance which is having particular dimensions.
2	Proportionality	Resistance is directly proportional to the length and temperature while it is inversely proportional to the cross-sectional area of the material.	Resistivity is only proportional to the nature and temperature of the particular material.
3	Symbol	R	ρ
4	Formula	R = V/I or, R = ρ(L/A)V = Voltage, I = Current, ρ = Resistivity	ρ = (R×A)/L R = Resistance, L= Length, A = Cross-sectional area
5	SI Units	The SI unit of resistance is Ohms	The SI unit of resistivity is Ohms-meter.

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ANSWER

Why o2 is very reactive

Posted by Nishant Kumar 5 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 3 months ago

Oxygen is very reactive with Alkali metals. Alkali metals are given the name alkali because the oxides of these metals react with water to form a metal hydroxide that is basic or alkaline. Lithium produces an oxide, sodium produces a peroxide, and potassium, cesium, and rubidium produce superoxides. Due to its electronegativity, oxygen forms stable chemical bonds with almost all elements to give the corresponding oxides. Cesium is so reactive with oxygen that it is used as a getter in vacuum tubes.

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