1.

Or, Write the formula for equivalent resistance for the combination ofsistances in (a) series (b) parallel.

Answer»

Let drop on R1 be V1 & drop on R2 be V2.

Total voltage V=V1+V2

We know that V=I*Req(ohms law)

So I*Req=(I*R1)+(I*R2)

Req=R1+R2

For parallel resistance:

In parallel circuits voltage drop across resistors will be same but the current flowing through each resistor depends on resistance valule.

Let current through R1 be I1 & current through R2 be I2.

I=V/Req(ohms law)

So I=I1+I2

V/Req=(V/R1)+(V/R2)

1/Req=(1/R1)+(1/R2)

Req=(R1*R2)/(R1+R2)


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