Three resistors of 10 ohm, 25 ohm, and 15 ohm are connected in parallel across a 3 V battery. What is the equivalent resistance of the combination?

1. For resistors in parallel, the equivalent resistance satisfies 1/R_equiv = 1/R1 + 1/R2 + 1/R3. 2. Substitute the values: 1/R_equiv = 1/10 ohm + 1/25 ohm + 1/15 ohm. 3. This sum equals approximately 0.2067 per ohm. 4. R_equiv = 1 / 0.2067 per ohm, which is approximately 4.84 ohm. 5. 50 ohm would result from mistakenly adding the resistances directly, as if they were in series. _Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section Find the Current through Parallel Resistors_