Q. 3 B3.9( 11 Votes )
A resistance of 4
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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