Question

Explain the terms:
1) Resistance
2) Resistivity
3) Ohm's law​

Answer 1

Answer:

Resistance is a measure of the opposition to current flow in an electrical circuit.

Resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length.

Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.

Ohm's Law (E = IR)

Answer 2

$\bigstar\huge\bf\underline{\underline{Answer:-}}$

$\bigstar\bf\underline{\underline{Resistance:-}}$

The resistance denoted by capital "R"

It is the opposition to the flow of current offered by the electrolytic solution. Its units are ohm $\bf(\ohm)$

S.I base units of ohm = (kg m²)/(S³A²)

The resistance 'R' offered by the electrolytic solution, taken in a conductivity cell, is directly proportional to distance of separation 'I' between the two cell and inversely proportional to the area of cross section (or) of electrode

$\sf R\alpha \frac{1}{a} \ or \ \rho .\frac{1}{a}$ Where $\rho$ = specific resistance (Resistivity). It can be measured with the help of wheat stone bridge.

$\bigstar\bf\underline{\underline{Resistivity:-}}$

The resistance in ohm of a conductor having length of 1 cm and area of cross section is called resistivity (or) "The resistance offered by an electrolytic solution" is called resistivity.

Its units are ohm - cm

S.I unit = ohm - meter

$\sf R = \rho X \frac{1}{a}$

$\bigstar\huge\bf\underline{\underline{Ohm's \ law:-}}$

It states that the current (I) flowing through a conductor at a given temperature is proportional to the potential difference (V) and inversely proportional to resistance (R). Mathematically it can be expressed as V = IR.