State and explain Joule's Law of Heating?

Joule’s law is an expression of the rate at which the resistance of a circuit changes electric energy into heat energy. The heat produced due to the flow of this current in an electric wire is represented in Joules.

Joule’s law of heating denotes the connection between heat generated via a conductor by flowing electric current.

Q = I² x R x T

Where Q is the amount of heat
I is the electric current
R is the amount of electric resistance in the conductor
T denotes time

As we know that

V = W/Q ----- (1)

Where

V = Volt
W = Work done
Q = Total charge

From equation 1, we get

W = VQ ----- (2)

Current (I) = Q/T ----- (3)

And

Q = IT ----- (4)

Substituting equation (4) in equation (3) we get

W = VIT ----- (5)

Considering Ohm’s law

V = IR ----- (6)

Now, substituting equation (6) in equation (5) we get

W = IRIT

W = I²RT

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State and explain Joule's Law of Heating?

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5.
This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

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State and explain Joule's Law of Heating?

Related Questions

CBSE CLASS XII Related Questions

5.This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

6.Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

5.
This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?

6.
Derive an expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d with air present between the plates.