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Answer the following :An electric iron of resistance 20heat developed in 30 seconds.takes a current of 5A. CalculateExplain the process of digestion of food in small intestine of man.

Answer»

Given that Resistance(R) = 20 Ω, Electric current (I)= 5 A and time(t)= 30 s

Now we know that H= I2Rt

= 5×5×20×30

= 15000J=1.5×104J

∴The heat developed in 30s is1.5×104J

Digestionbegins in the mouth with the secretion of saliva and itsdigestiveenzymes.

The partiallydigested foodenters the duodenum as a thick semi-liquid chyme.

In thesmall intestine, the larger part ofdigestiontakes place and this is helped by the secretions of bile, pancreatic juice andintestinaljuice.



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