State and derive joules law

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State and derive joules law

Posted by Geetha Bhat Geetha 5 years ago

CBSE > Class 10 > Science

3 answers

Maxtern .Op 5 years ago

Gaurav Seth will be the CBSE topper this year. Itna kaise padhata hai be

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Mayank Rauthan 5 years ago

Joule's law of heating states that heat produced in joules when a current of I amperes flows in a wire of resistance R ohms for time t seconds is given by H = I2Rt.

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Gaurav Seth 5 years ago

(a) Joule's law of heating states that heat produced in joules when a current of I amperes flows in a wire of resistance R ohms for time t seconds is given by H = I²Rt.

Thus the heat produced in a wire is directly proportional to:

(i) Square of current

(ii) Resistance of wire

(iii) Time for which current is passed

(b) Given: R₁=40ohms, R₂=60ohms (in series), V=220V, t=30sec

We know that

Total resistance, R=40+60=100ohms

By Ohm's law,

V = IR

I = V/R

I = 220/100 = 2.2amp

Putting the values of I, R and t in eq. H = I²RT

H = 2.2² X 100 X 30

H = 14520 J

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Posted by Pandey Ji 6 months ago

CBSE > Class 10 > Science