Find the expression for equivalent resistance when R₁ R₂ R3 are connected in series.
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The total potential difference across a combination of resistors in series is equal to the sum of a potential difference across the individual resistors.
V= V1+V2+V3
Let I be the current in the circuit. The current through each resistor is also I.
It is possible to replace the three resistors joined in series by an equivalent resistor of resistance R.
Applying Ohm's law,
V=IR
On applying Ohm's law to the three resistors respectively we further have
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