Question: What Is A Specific Resistance?

What is meant by 1 ohm?

The ohm is defined as an electrical resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the seat of any electromotive force..

What is specific resistance of a wire?

The Specific resistance of a material is the resistance offered by a one foot long wire of the material with a diameter of one MIL. The resistance of a wire is directly proportional to the specific resistance of the material. … The specific resistance of a material is denoted by the letter ‘K’.

What do you mean by resistance and specific resistance?

Resistance is the property of material to oppose the flow of electric current passing through it. Specific resistance is defined as the resistance offered by a unit length and unit cross-section of the substance to a current when a voltage is applied to it.

What is specific resistance biology?

Specific Resistance. = immunity. -resistance directed towards a specific pathogen. -body develops “memory” of pathogen for future protection. Branches of Specific Resistance.

How many volts are in an ohm?

1 volt1 ohm is equal to 1 volt/ampere. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between ohms and volts/ampere.

How do you calculate ohms?

Ohms Law and Power[ V = I x R ] V (volts) = I (amps) x R (Ω)[ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)[ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)It is sometimes easier to remember this Ohms law relationship by using pictures.More items…

What is the first line of defense?

The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, ‘friendly’ bacteria and white blood cells called neutrophils.

Is specific resistance and resistivity same?

The resistivity is also known as specific resistance. The resistivity represents the resistance of the material which has specific dimensions, i.e., the material has 1-meter length and 1 square meter area of cross section. The SI unit of resistivity is ohm meter.

What is the difference between resistivity and resistance?

Resistance is defined as the property of the conductor which opposes the flow of electric current. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. …

What are the factors affecting specific resistance?

Factors That Affect Resistance How much resistance a material has depends on several factors: the type of material, its width, its length, and its temperature. All materials have some resistance, but certain materials resist the flow of electric current more or less than other materials do.

What is the specific resistance of copper?

0.0171 OhmCopper has a resistivity of 0.0171 Ohm · mm²/m and is, therefore, one of the best conductors for electric current (slightly behind pure silver).

What does Ohm look like?

Set your multimeter to the highest resistance range available. The resistance function is usually denoted by the unit symbol for resistance: the Greek letter omega (Ω), or sometimes by the word “ohms.” Touch the two test probes of your meter together. When you do, the meter should register 0 ohms of resistance.

What is the 1st 2nd and 3rd line of defense?

The first line of defense are the physical and chemical barriers, which are considered functions of innate immunity. … The third line of defense is specific resistance, which is considered a function of acquired immunity.

What is specific resistance in the immune system?

The third line of defense is specific resistance. This system relies on antigens, which are specific substances found in foreign microbes. Most antigens are proteins that serve as the stimulus to produce an immune response. The term “antigen” comes from ANTI-body GENerating substances.

What is the dimension of specific resistance?

The dimensional formula fo resistivity in terms of M,L,T and Q where Q stands for the dimensions of charge is. Solution : Since, R=ρlA , where ρ is specific resistance.

What is the other name of specific resistance?

Specific electrical resistance is also known as electric resistivity is a property of material defining how strongly can the material oppose the flow of electric current. SI unit of electrical resistivity is ohm-meter and is represented as ⍴.

What happens to resistance if length is doubled?

Resistance is directly proportional to the length of the wire, and inversely proportional to the cross sectional area of the wire. … Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length.

What is specific resistance class 10?

Specific resistance or resistivity (ρ), of a conductor, is defined as the resistance of a conductor of unit length and unit area of cross-section. From the factors affecting the resistance of a conductor, the resistance is given by, Its SI unit is ohm-m.