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Write the expressions for the equivalent resistance R of three resistors R1, R2 and R3 joined in (a) parallel, (b) series.

Current Electricity

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Answer

(a) Equivalent resistance R of three resistors R1, R2 and R3 joined in parallel is given by —

1R\dfrac{1}{R} = 1R1\dfrac{1}{R}1 + 1R2\dfrac{1}{R2} + 1R3\dfrac{1}{R_3}

(b) Equivalent resistance R of three resistors R1, R2 and R3 joined in series is given by —

R = R1 + R2 + R3

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