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Lakhmir Singh & Manjit Kaur - Physics

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Q. 1 A3.9( 15 Votes )

With the help of

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

Answer :

Let the current in the circuit be I amperes and the battery be of strength V volts. Let the combined resistance of the three resistors be R ohms.

Therefore, according to Ohm's law, we have

V=IR ---- (i)

We know that when resistors are connected in series, the current with a battery of V volts.

V₁=I×R₁ ------- (ii)

V₂ =I×R₂ ------ (iii)

Let the potential difference across R₁ is V₁ and the potential difference across R₂ is V₂

V=V₁+V₂--------- (iv)

From equation (i),(ii), (iii) and (iv) we get.

IR= I×R₁+ I×R₂

R= R₁+ R₂

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