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What is jouls heating law? |
| Answer» 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\xa02\xa0rtThe 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 thatvolt= work done/ total charge or v = w/qfrom this we get w= vqwe know that current i = q / tso q = itputting this in prev equationwe get w = vitfrom ohms law v = irputting it in prev eq we getw = irit = i2rt joule as work is stored as heat soH = I2RT Joules | |