What is the electrical resistance of an object?

Electrical Resistance can be defined as the resistance towards the current when it moves via a bulb or any conductor. Electrical resistance is represented by the alphabet R. The unit of resistance is Ohm (Ω).

Step 1: Ohm’s Law

According to Ohm's law,

V ∝ I

$\therefore$ V = IR

Here,

V = Potential Difference (in Volts).
I = Current (in Amperes)
R = Resistance (in Ohms).

Step 2: Factors That Affect Electrical Resistance

Electrical resistance is proportional to a conductor's length and is also inversely proportional to its cross-sectional area.

$R = \rho {{L} \over A}$

Where,

L = Length.
A = Cross-sectional Area
ρ = Resistivity in Ohm meter (Ωm).

Some factors that affect electrical resistance include:

The cross-sectional area, length, and material of the given conductor.
The conducting material's temperature.

Hence, an object’s electrical resistance is directly proportional to the length and is also inversely proportional to the cross-sectional area.

Related Questions:

Read More:

Important Topics of Ohm’s Law
Derivation of Drift Velocity	Static Electricity	Internal resistance formula
Wheatstone Bridge	Difference between kva and kw	Combination of Resistors
Potentiometer	Unit of Specific Resistance	Relation between power and resistance
Difference between AC and DC	Differences Between Acceleration and Velocity	Resistor Colour Codes
Ampere	Resistivity Temperature Dependence	Permittivity And Permeability
Electric Dipole	Cells, emf, Internal Resistance	Relation between kva and kw
Meter Bridge	Difference between RTD and thermocouple	Electromotive Force
Ohm’s Law and its Limitations	Relation between resistance and length	Current Density
Types of Current	Resistance Formula	Types of Resistors
Uses of Resistor	Difference Between Primary Cell and Secondary Cell	Electrical Formula
Drift Velocity	Current Electricity	Voltage divider formula
Resistivity formula	Difference between air conditioning and refrigeration	Current density formula
Carbon Resistor	Difference between earth and neutral	Unit of Current
Cells in Series and in Parallel	Power Of Alternating Current	Circuit Diagram
Power transformers	NCERT Solutions Current Electricity	Difference between emf and voltage

CBSE CLASS XII Related Questions

1.
Consider a cylindrical conductor of length $ l $ and area of cross-section $ A $. Current $ I $ is maintained in the conductor and electrons drift with velocity $ \vec{v}_d \, (|\vec{v}_d| = \frac{eE}{m} \tau) $, where symbols have their usual meanings. Show that the conductivity of the material of the conductor is given by \[ \sigma = \frac{n e^2 \tau}{m}. \]

View Solution

2.
Write two advantages of reflecting telescope over refracting telescope.

View Solution

3.
Read the following paragraph and answer the questions that follow.
A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.

4.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

The total charge of the two spheres is conserved.
Both spheres attain the same potential.
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$

View Solution

5.
The resistance of a metal wire at $ 20^\circ \text{C} $ is $ 1.05 \, \Omega $ and at $ 100^\circ \text{C} $ is $ 1.38 \, \Omega $. Determine the temperature coefficient of resistivity of this metal.

View Solution

6.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

View Solution

What is the electrical resistance of an object?

Step 1: Ohm’s Law

Step 2: Factors That Affect Electrical Resistance

CBSE CLASS XII Related Questions

2.
Write two advantages of reflecting telescope over refracting telescope.

4.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

5.
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

6.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

What is the electrical resistance of an object?

Step 1: Ohm’s Law

Step 2: Factors That Affect Electrical Resistance

CBSE CLASS XII Related Questions

2.Write two advantages of reflecting telescope over refracting telescope.

4.Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

5. The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

6.With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
Write two advantages of reflecting telescope over refracting telescope.

4.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

5.
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

6.
With the help of a labelled diagram, explain the principle, construction and working of an a.c. generator.