What is the total resistance in a circuit with R1 = 20 ohms, R2 = 40 ohms, and R4 = 60 ohms?

To determine the total resistance in a circuit involving multiple resistors, it is essential to understand how resistors combine, whether in series or parallel. In this scenario, if the resistors R1, R2, and R4 are connected in series, the total resistance is the sum of all individual resistances.

Calculating the total resistance for resistors in series involves adding the resistance values directly: Total Resistance (R_total) = R1 + R2 + R4

Substituting the values: R_total = 20 ohms + 40 ohms + 60 ohms R_total = 120 ohms

This calculation confirms that the total resistance in the circuit is indeed 120 ohms when resistors are in series, which is why the selected answer is correct. When dealing with resistors in parallel, different calculations would be required, but given the context of the question, a series connection is assumed to be the case here.

The total resistance will vary widely based on how the resistors are connected, which is crucial to consider in electrical circuit design and analysis.