Identify whether the resistors are in series, parallel, or a combination
For series resistors, add all resistances: Req = R1 + R2 + R3 + …
For parallel resistors, use: 1/Req = 1/R1 + 1/R2 + 1/R3 + …
For two parallel resistors, use: Req = (R1 × R2) / (R1 + R2)
Reduce the circuit step by step, replacing each series or parallel group with its equivalent resistance
Repeat the process until only one equivalent resistance remains
For mixed circuits, simplify the innermost series or parallel sections first
Check units to ensure all resistances are in ohms
Verify the final equivalent resistance is reasonable compared with the original resistor values