What is jouls law

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What is jouls law

Posted by Vaishali Parkhe 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Deepa Kumari 5 years, 6 months ago

i^2 rt

0Thank You

Gaurav Seth 5 years, 6 months ago

Joule’s law of heating states that when a current ‘i ' passes through a conductor of resistance ‘r’ for time ‘t’ then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.

H = i 2 rt

The reason behind the heat produced is the collision of the free electrons with the lattice ions or atoms while accelerating in presence of the external electric field.

we know that

volt= work done/ total charge or v = w/q

from this we get w= vq

we know that current i = q / t

so q = it

putting this in prev equation

we get w = vit

from ohms law v = ir

putting it in prev eq we get

w = irit = i2rt joule as work is stored as heat soH = I2RT Joules

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