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Lakhmir Singh & Manjit Kaur - Physics

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Q. 3 B3.9( 11 Votes )

A resistance of 4

Class 10th Lakhmir Singh & Manjit Kaur - Physics 1. Electricity

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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