Question

State joules law of heating , it’s mathematical expression

and name two device which works on this principle.



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Answer 1

Answer:

heating can be processed by in many ways like convection, contraction and radiation.

Explanation:

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Answer 2

Explanation :-

Joule's law of heating states that :-

"Heat is directly proportional to the square of current, if resistance and time remain constant. "

It's mathematical expression is :-

H = I²Rt

Where :-

• H is heat energy.

• I is current.

• R is resistance.

• t is time.

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Two devices which work on it's principle are :-

(1) Electric bulb

(2) Electric fuse

Some Extra Information :-

The heat produced can be also written as :-

⇒ H = I²Rt

As, I = V/R

⇒ H = (V/R)²Rt

⇒ H = V²/R² × Rt

⇒ H = V²t/R