Three resistors of 2.0 ohm, 4.0 ohm and 6.0 ohm are connected in series across a battery. What is the equivalent resistance of the combination?

1. Series resistances add, so the three values go together directly. 2. Rs = 2.0 ohm + 4.0 ohm + 6.0 ohm = 12.0 ohm. 3. The value 1.1 ohm is what the same three resistors give in parallel, which is always below the smallest of them. 4. Keeping only 6.0 ohm or averaging to 4.0 ohm ignores that every resistor in the string is met by the same current. _Source: OpenStax College Physics (CC BY 4.0), Ch 21 "Circuits and DC Instruments", section 21.1 Resistors in Series and Parallel_