Question

derive the expression for equivalent resistance if three resistorsare in series combination​

Answer 1

Answer:

Re =R1+R2+R3.

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Answer 2

Hey friend!

Here is your answer!

Derivation for equivalent resistance if three resistors are connected in series,

Total p.d,

=V=V1+V2+V3 ---------(1)

The current remains the same because it is in series,

On applying ohm's law,

=V=IR

On applying ohm's law separately for each resistor,

=V1=IR1

=V2=IR2

=V3=IR3

Therefore from (1),

=IR=IR1+IR2+IR3

=I(R)=I(R1+R2+R3)

=Rs=R1+R2+R3

Hope this helps you!

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