Physics, asked by julius1721, 1 year ago

Derivation of joules law of heating effect

Answers

Answered by priya9784
5
P=V q÷t =VI
H=VIT
by applying ohms law
H=square of the current ×R×t
Answered by DIVINEREALM
33

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According to Joules law of heating, when a current I flows through a resistance R then :

Heat produced is

(I) Directly proportional to the square of current for a given resistance

(II) Directly proportional to the resistance of given circuit.

(III) Directly proportional to the time for which the resistance flows through the resistor.

So eqⁿ is \bold{\huge{\boxed{\red{H=I^2Rt}}}}}

\bold{\huge{\boxed{\pink{DERIVATION}}}}

let us consider a resistance R , in which I amount of current flows.

Work must be done by current to move continuously.

W=Qx V

BUT Q=IXt

W=IxVxt

but from ohms law: V=IR

\bold{\huge{\boxed{\purple{W=I^2Rt}}}}

assuming the electrical energy consumed is converted into heat energy .

we write work done as Heat  produced.

so \bold{\huge{\boxed{\red{H=I^2Rt}}}}}

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