Answer :

Here it is given that R1 = 40 ohms, R2 = 60 ohms, V = 220V, t = 30 sec

Here R1 and R2 are arranged in series connection.


So the equivalent resistance = R = 40+60 = 100 ohms


According to Ohm's law, we know that


V = IR


I = V/R


I = 220/100 = 2.2amp


As we know that heat produced in joules is given by H = I2Rt


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


H = (2.2)2 X 100 X 30


H = 14520 J


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