Question

explain with the helps of labelled circuit diagram how you will find resistor of resistance R1 R2 1• in parallel 2•in series

Answer 1

hello friend...!!

• Case ( 1 ) resistors in parallel :

we know that, if resistors are parallel then the voltage accross each resistor remains constant and current varies,

implies,

I = I(1) + I(2) + I(3)

I = V / R

implies,

V / R = V / R1 + V / R2

V/R = V ( 1/R1 + 1/R2 )

implies,

1/R = 1/R1 + 1/R2

• Case (2) resistors in series,

• if resistors are connected in series, the voltage across each resistors varies and current remains constant

therefore ,

V = V1 + V2

IR = IR1 + IR2

implies,

IR = I ( R1 + R2 )

R = R1 + R2

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The attached picture gives you the circuit diagram

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Hope it helps..!!