Online Tution   »   Ohm’s Law

Ohm’s Law: Definition, Formula, Examples

Ohm’s Law – Definition

At constant temperature, Georg Ohm discovered that the electrical current flowing through a given linear resistance is exactly proportional to the voltage placed across it, as well as inversely proportional to the resistance. Ohms Law is based on the relationship between voltage, current, and resistance. Or the link between electric current and a potential difference is described by Ohm’s law. In most conductors, the current is exactly proportional to the voltage applied to them. Georg Simon Ohm, a German scientist, was the first to verify Ohm’s law by experiment. In this article, we will discuss ohm’s law in detail, the students must bookmark this page to get all the updates. 

Read More: Viscosity of Water: Meaning, Formula, Unit, Examples, Symbol

Read More: Aerobic Respiration

Ohm’s Law states that voltage is directly proportional to current and resistance

Below we have given the formula of ohm’s law by using the formula given below students can calculate the value of Voltage, Resistance, and Current.

V = IR 

This shows voltage is directly proportional to current.

V = Voltage or potential difference of conductor

I =  current flowing through the conductor

R = Resistance

I = V/R

We can find current by the above formula if voltage and resistance are given. 

R = V/I

We can find the resistance by using the above formula if we know voltage and current. 

Ohm’s Law gives a Relationship between Current, Voltage, and Resistance

Here we will check the resistance on different voltage and current, have a look at the table given below. 

Voltage(V) Current(I) Resistance(R)

R = V/I

0.5 1 0.5
1 2 0.5
2 2 1
3 1 3
4 2 2
6 2 3
8 2 4
10 2 5
12 3 4
14 7 2
16 4 4
18 9 2
20 10 2
15 7 2.5
14 2 7
22 11 2
13 2 6.5
11 2 5.5
19 2 9.5

Read More: Vermicompost / Vermicomposting: Meaning, Process, Price

Read More: Respiratory System: Parts, Function, Organs and Diseases

Ohm’s Law for a Magnetic Circuit

Ohm’s law for magnetic circuits is F=ϕS.
Explanation: Ohm’s law for magnetic circuits states that the MMF is directly proportional to the magnetic flux where reluctance is the constant of proportionality.

Ohm’s Law is true for

Ohm’s law is true for all metallic conductors at low temperatures. “In metallic conductors at constant temperature and zero magnetic fields, the current flowing is proportional to the voltage across the ends of the conductor, and is inversely proportional to the conductor’s resistance,” according to Ohm’s Law.

Ohm’s Law in vector form

Ohm’s law in vector form is J=σE

This is atom’s law in vector form

where J = current density
E = potential gradient
σ = conductivity

How Ohm’s Law is applicable to others with Examples?

Below we have given examples of ohm’s law the students preparing for boards, competitive exams, or engineering entrance exams must know the applications of ohm’s law. Below we have given some examples because numerical questions can be asked on ohm’s law. Hence, the students must solve the questions and before jumping on questions the students must know the concept of ohm’s law. Physics is all about concepts and is numerically based on those concepts. Thus, the students must not rely on theory in physics, they must solve questions based on the concepts of ohm’s law. 

Q.1 In a circuit, a battery of 20 volts is connected and the current flow through that circuit is 10 ampere. Find out the resistance connected in the circuit?

Ohm’s law states that

R = V/I

Given, the Voltage of the circuit is  20 volt.

Current flowing through the circuit is 10 ampere

By using ohm’s law, Resistance of the circuit(R) = 20/10

Resistance of the circuit(R) = 2 ohm

Thus, the resistance connected in the circuit is 2 ohm

Q. In an electric circuit, a 12-volt battery is connected with resistance. The value of resistance is 6 ohm. Find the current flowing through the circuit?

Ohm’s law states that

I = V/R

Given, the Voltage of the circuit is  12 volts.

Resistance connected in an electric circuit is 6 ohm.

Find: Current flowing through the electric circuit I =?

By using ohm’s law

Current flowing through the electric circuit I = V/R

current flowing through the electric circuit I = 2 amp

Thus, the current flows through the electric circuit  2 amp.

Q. A 12 amp current is flowing through an electric circuit and a battery of V volt is connected to the circuit. The resistance of 0.5 ohms is connected in series with the battery. Find the value of V?

Ohm’s law states that

V= IR

Given, Current flowing through the electric circuit I = 12 amp

Resistance connected in series to the battery = 0.5 ohms

Find: Voltage V =?

By using ohm’s law

Voltage of the Battery V = IR

voltage of the Battery V = 12*0.5

Voltage of the Battery V = 6 V

Read More: Glycolysis: Pathway, Reaction, Diagram

Read More: Fermentation: Process, Examples, Reaction, Diagram

FAQs on Ohm’s Law

Q. What is ohm’s law?

Ohm’s law asserts that the voltage across a conductor is proportional to the current flowing through it if all physical parameters and temperature stay constant. 

Q. What is the formula to calculate voltage using ohm’s law?

The formula to calculate voltage using ohm’s law

V = IR

Q. What is the formula to calculate current using ohm’s law?

 The formula to calculate current using ohm’s law 

I = V/R

Q. What is the formula to calculate resistance using ohm’s law?

The formula to calculate resistance using ohm’s law

R = V/I

Q. What is R in ohm’s law formula?

R is resistance in the ohms law formula. 

 

Sharing is caring!

Thank You, Your details have been submitted we will get back to you.
Was this page helpful?

Leave a comment

Your email address will not be published. Required fields are marked *