IBPS Clerk Vacancy 2023: The Institute of Banking Personnel Selection (IBPS) will release the IBPS Clerk vacancy 2023 along with the official notification. A total...
IBPS Clerk Vacancy 2023: Check Total Openings
May 13, 2024Joule’s Law is a mathematical representation of the rate at which the resistance in a circuit turns electric energy into heat energy. Students might already know the impact of electric heating current. The heat is created due to the collision among electrons in the wire. Students often have questions about the volume of heat generated from current flowing through a wire and also want to learn the parameters and conditions on which the law is based. To answer these questions, Joule derived a formula precisely describing the phenomenon called the Joule’s Law.
The amount of heat that is created inside the electric wire due to the transfer of current is represented in the unit of Joules. Joule’s Law says that during the flow of a current in a conductor, the amount of heat created is directly proportional to the resistance, current, and time in the current that is flowing.
H is directly proportional to i2 (where resistance and time are constant)
H is directly proportional to R (where resistance and time are constant)
H is directly proportional to t (where R and current flowing are constant)
The English physicist James Prescott found that the amount of heat per second generated in a conductor carrying a current is directly proportional to the electrical resistance of the wire and the square of this passing current.
The heat that is created because of the flow of current in an electric wire is represented in Joules. Below is the mathematical expression of Joule’s Law:
As per the Joule’s first law, the relationship between heat that is generated from the flowing electric current through a conductor is expressed as:
Q = I2 R T
Where,
Question: Calculate the heat (energy) generated in resistance of 4 Ω when 3 A current flows through it for 2 minutes.
The amount of heat generated by the conductor is given by the formula:
Q = I2 R T
By putting the values in the above mathematical equation we get,
Q = 32 × 4 × 60 = 2160 J
Question: A heater having resistance 200 Ω is connected to the main supply of power for 20 minutes. If a 10 A current flows through the conductor of the heater, then calculate the heat generated in the heater.
The amount of heat that is generated by the heater can be calculated as follows:
Q = I2 R T
substituting the values in the equation, we get
Q = 102 × 200 × 20 × 60 = 24000000 J or 24 MJ.
We hope this article on Joule’s Law of Heating Effect helps you. If you have any academic queries, do reach out to us. You can write us a mail at [email protected] or call 18002572961 (Toll-Free). We will be happy to help you.
For more informative articles, keep visiting Embibe.