What is the dimensional formula for gas constant?
Or, G = [M1 L-1 T-2] × [L3] × [K1]-1 = [M1 L2 T-2 K-1]. Therefore, the gas constant is dimensionally represented as [M1 L2 T-2 K-1].
What is the dimensional formula of Boltzmann constant?
Or, k = [M1 L2 T-2] × [M0 L0 T0 K1]-1 = [M1 L2 T-2 K-1]. Therefore, the Boltzmann constant is dimensionally represented as [M1 L2 T-2 K-1].
What is the dimensional formula of radius?
For example, if r is the radius of a cylinder and h is its height, then we write [r] = L and [h] = L to indicate the dimensions of the radius and height are both those of length, or L. Similarly, if we use the symbol A for the surface area of a cylinder and V for its volume, then [A] = L2 and [V] = L3.
What is the unit of the resistance?
The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Ohm.
What is a specific resistance of a wire?
The specific resistance or resistivity of a wire is the property of the material of it. It does not depend on mass, length or cross-section of wire.
Which of the following material has the highest specific resistance?
Resistivity and Temperature Coefficient at 20 C
| Material | Resistivity ρ (ohm m) | Ref |
|---|---|---|
| Silver | 1.59 | 3 |
| Copper | 1.68 | 3 |
| Copper, annealed | 1.72 | 2 |
| Aluminum | 2.65 | 1 |
How does specific resistance of a wire depends on its length and radius?
We know that the resistance of a wire is inversely proportional to the cross-sectional area of the wire. However, the cross-sectional area of the wire is proportional to the square of the radius of the wire. This means that the resistance of the wire and radius of the wire is inversely proportional to each other.
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 resistivity is directly proportional to the temperature of the material.
What are the examples of non-ohmic resistance?
The example of non-ohmic resistance is A) Diode B) Copper wire C) Filament lamp D) Carbon resistor
| S.No. | Ohmic resistance | Non-ohmic resistance |
|---|---|---|
| 4. | Example- Copper wire, filament lamp, carbon resistor, etc. | Example- Diode, semiconductors, inductor, etc. |
What are ohmic resistance give two examples?
examples of ohmic resistors are carbon and metals.
How do you calculate ohmic resistance?
Ohms Law and Power
- To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
- To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
- To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
- To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)