Ohm's Law - Definition, Formula, Applications, FAQs

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# Ohm's Law - Definition, Formula, Applications, FAQs

Edited By Team Careers360 | Updated on Feb 14, 2022 02:45 PM IST

## What is ohm’s law Class 10? Explain Ohm’s law. State ohm’s law class 10 and give ohm’s law formula.

Georg Simon Ohm, a German physicist, invented Ohms law, which describes the relationship between potential difference and current.
Ohm’s law statement: According to Ohms law, the steady current I flowing through a conductor is proportional to the potential difference V between the conductor's two ends at a constant temperature. The link between an electric current and the potential difference is defined by Ohms law.
The formula of ohm’s law, V=IR
Ohm’s law is the most fundamental law in electricity.

### Derivation of ohm’s law

An electric current flowing through a conductor is precisely proportionate to the difference in potential between the conductor's two ends, according to ohm’s law.

I proportional to V

Hence, IV=constant

The value of this constant proportionality constant is found to be 1/R

Therefore, I=V/R

V=IR

Here, R is a constant for a given material at a given temperature and which is known as the resistance of the material. Since the potential difference V is proportional to the current I, the graph between Vand I is a straight line for a conductor.

Ohmic conductor graph:

## Definition:

Electric circuit:

A closed conducting loop or path with a network of electrical components through which electrons can flow is known as an electric circuit. This loop is made using the electrical wires which is to connect an electric appliance to a source of the electric charges like a battery. An electric circuit must be closed in order that the current passes through it.

Electric current:

Current is defined as the rate at which charges flow through a conductor, implying that the electric current represents the number of charges flowing through any cross-section of a conductor in a given amount of time. The letter I stands for current. If a net charge Q travels through any cross-section of a conductor in time t, the current flowing through it is

I=Q/t

The ampere is the SI unit of electric current and is represented by the letter. When a charge of coulomb runs over any cross-section of a conductor in one second, the current flowing through it is said to be one ampere.

1 ampere=1 coulomb/1 second

When a conducting path is given to a charged object, electrons begin to flow through the path from a higher to a lower potential state. The potential difference can be produced by using a cell or battery. A current of electricity is generated as electrons move. Therefore, an electric current is produced by the moving electrons.

An ammeter is a device that is used to determine the strength of an electric current in a circuit. In a circuit where the current is to be found, the ammeter is connected in series.

 Related Topics,

Potential difference:

The amount of labour involved in transporting against the electric force, a unit counter electrode from one position to another is described as the electric potential difference between two points. The potential difference required for the flow of charges can be provided by the battery. From the negative electrode to the positive electrode, electrons flow. The letter Vdenotes the possibility of a difference.

V=work done (w)/charge (Q)

The volt is the SI unit for electric potential difference and is symbolised byV. The potential difference between two points is one volt if one joule of labour is expended in moving one coulomb of charge from one point to another against the electric force.

1 volt=1 joule/1 coulomb

Joule is a unit of measurement for the quantity of electrical energy transferred into other forms of energy and the amount of charge is measured in coulomb.

A voltmeter is a tool that measures the difference in potential between two ends. The voltmeter must always be connected in parallel to a component in a circuit to evaluate the potential difference across it.

Resistance:

The property of a substance to oppose the flow of charges and thus the passage of current through it is known as resistance. The ratio of the potential difference between the conductor's ends to the current flowing through it is the conductor's resistance. The letter R stands for resistance.

R=VI

The ohm is the SI unit of resistance and is represented by the symbol. When a conductor carries a one-ampere current and a one-volt potential difference is maintained across its ends, the resistance is said to be one ohm.

1ohm=1 volt/1 ampere

With the help of the resistance, we can regulate the quantity of current flowing in a circuit. When the flow of current is obstructed, heat is generated. This is because electrons encounter resistance as they move along a wire. To overcome the opposition that has been converted into heat energy, work must be done. This conversion of electrical energy into heat energy is called Joule heating. The components used for providing resistance are called resistors.

The measure of resistance given by a component to the flow of electric current through it is called resistance. Different electrical components offer different electrical resistance. Metals such as copper, aluminium etc. offers negligible resistance to the electric current. These are good conductors. The materials like Nichrome, tin oxide etc. provide a high level of resistance to electric current.

Ohm’s law for Power:

Power is the rate of consuming electrical energy and is defined as the rate of accomplishing work or spending energy. It determines how efficiently electrical energy is transferred into another form of energy.

If a current streams through a conductor with resistance for a period, the potential difference between the conductor's two ends is. The equation gives the work done to transfer the charge across the ends of the conductor.

W=VIt

P=VIt/t

P=VI

## Applications of ohm’s law:

At constant temperature, ohm’s law can be applicable. Electricity's fundamental law is Ohm’s law. The applications of ohm’s law are,

• In an electric circuit, the current, potential difference and resistance can be determined.
• The power efficiency of an electric circuit can be calculated.
• Ohm’s law is applicable to the linear elements

Failures of ohm’s law:

• The behaviour of devices such as diodes and transistors is not explained by Ohm’s law.
• Ohm’s law does not give the expected result at the variable temperature.
• Ohm’s law cannot be applicable to non-linear elements.

NCERT Physics Notes:

## Uses of ohm’s law:

• We may control the speed of the fans in our residences by pushing the regulator back and forth.
• The current going through the fan is regulated here by regulating the resistance via the regulator.
• Using Ohm’s law, we can determine the resistance, current, and consequently power flowing for any given input value.

Experimental verification of Ohm’s law circuit diagram:

A parallel connection is made between a voltmeter and a resistor. An ammeter is interfaced to measure the current in the circuit. A variable resistor is connected to the circuit. Changing the resistance changes the potential drop across the resistor, affecting the amount of current flowing through it. We can deduct from the reading that current and potential vary linearly.

A Nichrome wire is connected between X and Y. When you use a copper wire rather than just a Nichrome wire in the same experiment, you'll need a different current for the same potential difference across the wire. If you replace the copper wire with an aluminium wire, the current running through it will have a different value. From the equation V=IR, you have learnt that VI must be equal to the resistance of the conductor used. The variations in the current for the same values of potential difference indicates that the resistance of different material is different.

Ohm’s law for the magnetic circuit:

In a magnetic field, the magnetomotive force is proportional to the product of the number of turns around the core in which the flux can be produced and the current through the turns of the wire.

Fm=NI

Where, Fm- Magnetomotive force

N – Number of turns around the core

I – Current flows through the turns of the wire.

### Numericals on ohm’s law

1. A 12 coulombs charge passes through a bulb in 5 seconds. How much current passes through the bulb?

Solution:

Charge, Q=12 C

Time,t=5 s

To find the current:

I=Q/t

I=12/5

I=2.4 A

Hence, the current flows through the bulb is 2.4 A

2. Moving a charge of 10 C across two locations in a circuit requires 100 J of labour. What could be the difference between the two points?

Solution:

Charge, Q=10 C

Work done, W=100 J

To get the possible difference between the points, do the following:

V=work done (w)/charge (Q)

V=100/10

V=10 Volt

Hence, the potential difference between the two points is 10 Volt.

3. Calculate the resistance of a conductor with a 2 A current and a 30 V potential difference between its ends.

Solution:

Current through the conductor, I=2 A

The potential difference between its ends, V=30 V

From ohm’s law,

R=V/I

R=30/2

R=15 Ω

Hence, the resistance of the conductor is 15 Ω

4. A lamp of resistance 70 Ω draws a current of 0.75 A . Find the voltage

Solution:

Resistance, R=70 Ω

Current, I=0.75 A

To find the voltage:

From ohm’s law,

V=IR

V=0.75(70)

V=52.5 V

Hence, the voltage of a lamp is 52.5 V

5. A bulb with a resistance of 400 ohms is connected to a 220 V power supply. Calculate the magnitude of the current

Solution:

Resistance, R=400 Ω

The potential difference, V=220 V

To find the magnitude of the current:

From ohm’s law,

V=IR

I=V/R

I=220/400

I=0.55 A

Hence, the magnitude of the current is 0.55 A

6. When the potential across the filament of a bulb is 100 V, the current through it is found to be 2 A. Find the resistance of the filament.

Solution:

Potential across the filament, V=100 V

The flow of current, I=2 A

To find the resistance of the filament:

From ohm’s law,

V=IR

R=V/I

R=100/2

R=50 Ω

Hence, the resistance of the filament is 50 Ω

7. A resistance of 15 Ω carries a current of 5 A. Calculate the voltage that has built up across the resistor.

Solution:

Resistance, R=15 Ω

Current, I=5 A

To find the voltage developed across the resistor:

From ohm’s law,

V=IR

V=(5)(15)

V=75 V

Hence, the voltage across the resistor is 75 V

8. A lamp draws a current of 0.91 A with a potential difference of 110 V. What is the resistance in the lamp?

Solution:

Current, I=0.91 A

The potential difference, V=110 V

To find the resistance in the lamp:

From ohm’s law,

V=IR

R=V/I

R=110/0.91

R=121 Ω

Hence, the resistance in the lamp is 121 Ω

Also check-

1. State ohm’s law.

According to Ohm’s law, the steady current I flowing through a conductor is proportional to the potential difference V between the conductor's two ends at constant temperature..The link between an electric current and the potential difference is defined by Ohm’s law.

2. Write the formula for Ohm’s law.

Formula of ohm’s law, V=IR

3. What are the applications of Ohm’s law?

At constant temperature, ohm’s law can be applicable. Electricity's fundamental law is Ohm’s law. The applications of ohm’s law are,

• In an electric circuit, the current, potential difference and resistance can be determined.

• The power efficiency of an electric circuit can be calculated.

• Ohm’s law is applicable to the linear elements

4. What are the uses of Ohm’s law?
• We may control the speed of the fans in our residences by pushing the regulator back and forth.

•  The current going through the fan is regulated here by regulating the resistance via the regulator.

•  Using Ohm’s law, we can determine the resistance, current, and consequently power flowing for any given input value.

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A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.

3 Jobs Available
##### Quality Controller

A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.

A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.

3 Jobs Available
##### Production Manager

Production Manager Job Description: A Production Manager is responsible for ensuring smooth running of manufacturing processes in an efficient manner. He or she plans and organises production schedules. The role of Production Manager involves estimation, negotiation on budget and timescales with the clients and managers.

3 Jobs Available

A Team Leader is a professional responsible for guiding, monitoring and leading the entire group. He or she is responsible for motivating team members by providing a pleasant work environment to them and inspiring positive communication. A Team Leader contributes to the achievement of the organisation’s goals. He or she improves the confidence, product knowledge and communication skills of the team members and empowers them.

2 Jobs Available
##### Quality Systems Manager

A Quality Systems Manager is a professional responsible for developing strategies, processes, policies, standards and systems concerning the company as well as operations of its supply chain. It includes auditing to ensure compliance. It could also be carried out by a third party.

2 Jobs Available
##### Merchandiser

A career as a merchandiser requires one to promote specific products and services of one or different brands, to increase the in-house sales of the store. Merchandising job focuses on enticing the customers to enter the store and hence increasing their chances of buying a product. Although the buyer is the one who selects the lines, it all depends on the merchandiser on how much money a buyer will spend, how many lines will be purchased, and what will be the quantity of those lines. In a career as merchandiser, one is required to closely work with the display staff in order to decide in what way a product would be displayed so that sales can be maximised. In small brands or local retail stores, a merchandiser is responsible for both merchandising and buying.

2 Jobs Available
##### Procurement Manager

The procurement Manager is also known as  Purchasing Manager. The role of the Procurement Manager is to source products and services for a company. A Procurement Manager is involved in developing a purchasing strategy, including the company's budget and the supplies as well as the vendors who can provide goods and services to the company. His or her ultimate goal is to bring the right products or services at the right time with cost-effectiveness.

2 Jobs Available
##### Production Planner

Individuals who opt for a career as a production planner are professionals who are responsible for ensuring goods manufactured by the employing company are cost-effective and meets quality specifications including ensuring the availability of ready to distribute stock in a timely fashion manner.

2 Jobs Available
##### ITSM Manager

ITSM Manager is a professional responsible for heading the ITSM (Information Technology Service Management) or (Information Technology Infrastructure Library) processes. He or she ensures that operation management provides appropriate resource levels for problem resolutions. The ITSM Manager oversees the level of prioritisation for the problems, critical incidents, planned as well as proactive tasks.

3 Jobs Available
##### Information Security Manager

Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack

3 Jobs Available
##### Computer Programmer

Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

3 Jobs Available
##### Product Manager

A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.

3 Jobs Available
##### IT Consultant

An IT Consultant is a professional who is also known as a technology consultant. He or she is required to provide consultation to industrial and commercial clients to resolve business and IT problems and acquire optimum growth. An IT consultant can find work by signing up with an IT consultancy firm, or he or she can work on their own as independent contractors and select the projects he or she wants to work on.

2 Jobs Available
##### Data Architect

A Data Architect role involves formulating the organisational data strategy. It involves data quality, flow of data within the organisation and security of data. The vision of Data Architect provides support to convert business requirements into technical requirements.

2 Jobs Available
##### Security Engineer

The Security Engineer is responsible for overseeing and controlling the various aspects of a company's computer security. Individuals in the security engineer jobs include developing and implementing policies and procedures to protect the data and information of the organisation. In this article, we will discuss the security engineer job description, security engineer skills, security engineer course, and security engineer career path.

2 Jobs Available
##### UX Architect

A UX Architect is someone who influences the design processes and its outcomes. He or she possesses a solid understanding of user research, information architecture, interaction design and content strategy.

2 Jobs Available
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