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.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

View Solution

2.
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° 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

3.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

View Solution

4.
Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons. Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Both Assertion (A) and Reason (R) are false.

View Solution

5.
Write any two features of nuclear forces.

View Solution

6.
Two parallel plate capacitors X and Y are connected in series to a 6 V battery. They have the same plate area and same plate separation but capacitor X has air between its plates, whereas capacitor Y contains a material of dielectric constant 4. Calculate the capacitances of X and Y, if the equivalent capacitance of the combination of X and Y is \( 4 \, \mu\text{F} \). Calculate the potential difference across the plates of X and Y.

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.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

2.
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° in 0.2 s. The value of emf induced in the loop will be:

3.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

4.
Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons. Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

5.
Write any two features of nuclear forces.

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.Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

2.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° in 0.2 s. The value of emf induced in the loop will be:

3. If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

4.Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons. Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

5. Write any two features of nuclear forces.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

2.
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° in 0.2 s. The value of emf induced in the loop will be:

3.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

4.
Assertion (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons. Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

5.
Write any two features of nuclear forces.