Question

what is Joule law of heating effect give two application of heating effect

Answer 1

it says that the amount of heat produced is directly proportional to a-resistance of the conductor b-square of electric current through the circuit c-the time for which current flows through the circuit. application- tungsten has high resistance and high melting point when electric current is passed through this tungsten a large amount of heat is generated due to which the filament becomes extremely hot and start heating light. 2 the resistivity or resistance of nichrone alloy is very high, has high melting point do not get oxidised easily. So, when electric is passed through it large amount of heat is generated and it becomes red hot.

Answer 2

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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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