2 resistors of 4 ohm each are connected in series. What is their equivalent…

For resistors connected in series, the equivalent (total) resistance is the sum of the individual resistances, since the same current flows through each one in turn: Req = R1 + R2 + ... + Rn.

1. Identify the two resistors: R1 = 4 ohm and R2 = 4 ohm, connected in series.

2. Apply the series formula: Req = R1 + R2.

3. Substitute the values: Req = 4 ohm + 4 ohm = 8 ohm.

Cross-check: since both resistors are equal, the series equivalent must be exactly twice one resistor's value (2 x 4 ohm = 8 ohm), which confirms the result.