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.
Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.

View Solution

2.
A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

the induced current will flow in the anticlockwise direction.
the induced current will flow in the clockwise direction.
no induced current will flow in the solenoid.
the magnet will fall with a constant velocity.

View Solution

3.
A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

80 Wb
16 Wb
$8 \times 10^{-2}$ Wb
$8 \times 10^{-3}$ Wb

View Solution

4.
Consider the nuclear reaction $ X \to Y + Z $. Let $ M_x $, $ M_y $, and $ M_z $ be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

$ (M_x - M_z)<M_y $
$ (M_x - M_y)<M_z $
$ M_x>(M_y + M_z) $
$ M_x<(M_y + M_z) $

View Solution

5.
(I) The real image of an object placed between $f$ and $2f$ from a convex lens can be seen on a screen placed at the image location. If the screen is removed, is the image still there? Explain.
(II) Plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.

View Solution

6.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

5 V
3.5 V
2.5 V
Zero V

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

1.
Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.

2.
A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

3.
A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

4.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

6.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

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

1.Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.

2.A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

3.A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

4.Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

6.A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.

2.
A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

3.
A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:

4.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

6.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be: