Series: Current is constant, Voltage splits up, There is 1 path for the current to flow, Rt=R1+R2+R3, Adding resistance increases the total resistance, Parallel: Current splits up, Voltage across each branch is equal to the supply voltage, There is more than one path for the current to flow, 1/Rt=1/R1+1/R2+1/R3, Adding resistance decreases the total resistance,

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