Why Do We Use Ohm's Law?

Ohm’s law is an important law in electric circuits which represents the relationship between voltage, current, and resistance.

Ohm’s law can be used to control the amount of current that flows through a circuit by adding resistors in order to reduce the current flow or by removing the resistors to increase the flow of current.
Ohm’s law is useful in the analysis of the circuits, especially when it was combined with Kirchhoff’s Laws.

Related Questions

Read More:

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

CBSE CLASS XII Related Questions

1.
A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.
View Solution
2.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.
View Solution
3.
A wire of length \(L\) is bent round into (i) a square coil having \(N\) turns and (ii) a circular coil having \(N\) turns. The coil in both cases is free to turn about a vertical axis coinciding with the plane of the coil, in a uniform, horizontal magnetic field and carry the same currents. Find the ratio of the maximum value of the torque acting on the square coil to that on the circular coil.
View Solution
4.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:
- \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})\)
- \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})\)
- \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})\)
- \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})\)
View Solution
5.
A circular coil of 100 turns and radius $\left(\frac{10}{\sqrt{\pi}}\right)$ cm carrying current of $5.0\,\text{A}$ is suspended vertically in a uniform horizontal magnetic field of $2.0\,\text{T}$. The field makes an angle $30^\circ$ with the normal to the coil. Calculate:
(I) the magnetic dipole moment of the coil, and
(II) the magnitude of the counter torque that must be applied to prevent the coil from turning.
View Solution
6.
(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

Similar Physics Concepts

Meter Bridge: Definition, Working Principle & Examples

Potentiometer: Working Principle, Types & Applications

Ohm's Law and Its Limitations: Explanation & Applications

Cells, EMF and Internal Resistance: Equations & Examples

Combination of Cells in Series and in Parallel

Electric Current: Effects, Types and Properties

Wheatstone Bridge: Derivation, Formula & Applications

Resistors in Series and Parallel Combination: Formula and Examples

Current Electricity: Definition, Types, Formulas & SI Units

Ampere: Definition, Conversions and Ammeter

CBSE CLASS XII Previous Year Papers

Physics

Physics Preparation Guides

Electric Charges and Fields: Flux, Gauss Law & Coulomb's Law

Applications of Gauss Law: Formula & Gauss Theorem

Coulomb’s Law: Formula, Vector Form & Limitations

Electric Charge: Definition, Formula, Types and Properties

Electric Field: Definition, Formula & Electric Field Direction

Gauss Law: Formula, Gauss Theorem & Electric Flux

Dipole in a Uniform External Field: Torque, Frequency, and Time Period

Electric Dipole: Definition, Significance and Electric Dipole Moment

Electric Flux: Formula, Equation, Symbol & SI Unit

Electrostatic Potential: Definition, Formula and SI Unit

Electric Potential Due to a Point Charge: Derivation & Formula

Potential Due to an Electric Dipole: Introduction, Formula and Derivation

Equipotential Surface: Work Done, Properties & Magnitude

Van de Graaff Generator: Principle, Working, and Construction

Energy Stored in a Capacitor: Formula, Derivation and Applications

Electrostatic Potential and Capacitance: Introduction & Derivations

Electric Charges and Fields Important Questions

Kirchhoff's Laws: Kirchhoff's Current and Voltage Laws & Applications

Meter Bridge: Definition, Working Principle & Examples

Potentiometer: Working Principle, Types & Applications

Physics NCERT Solutions

Doppler Shift: Formula & Applications

Volcanoes Eruption: Definition, Formation and Causes

Alpha-Particle Scattering and Rutherford’s Nuclear Model of Atom: Explanation

Tension Formula: Explanation and Solved Examples

Pressure Formula: Partial, Osmotic & Absolute Pressure

NCERT Solutions For Class 12 Physics Chapter 1: Electric Charges and Fields

NCERT Solutions For Class 12 Physics Chapter 8: Electromagnetic Waves

NCERT Solutions For Class 12 Physics Chapter 6: Electromagnetic Induction

NCERT Solutions for Class 12 Physics Chapter 13: Nuclei

NCERT Solutions For Chapter 14: Semiconductor Electronics

Comments

No Comments To Show

SUBSCRIBE TO OUR NEWS LETTER

COLLEGE NOTIFICATIONS

EXAM NOTIFICATIONS

NEWS UPDATES

Download the Collegedunia app on

downloadapp_banner image

downloadapp_banner image

© 2026 Collegedunia Web Pvt. Ltd. All Rights Reserved