state joules law? derive the expression for joules law?
Answers
Answer:
A quantitative form of Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R.
Explanation:
Joule’s law is a mathematical expression of the rate at which resistance in a circuit turns electric energy into heat energy. The heat produced because of the current flow in an electric wire is represented in Joules.
The joule’s law of heat displays the connection between heat generated Via a conductor by flowing electric current.
Q = I2 ✕ R ✕ T
Where
Q = Amount of heat
I = Electric current
R = Amount of electric resistance in the conductor
T = Time
we know that
V = W/Q………………………..(1)
Where
V = Volt
W = Work done
Q = Total charge
Equation (1) we get
W = VQ…………………(2)
And Current (I) = Q/T…………………(3)
And Q = IT……………….(4)
Substitute equation (4) in equation (3) we