A 4 ohm resistor and a 6 ohm resistor are joined in series. What is the total resistance?

1. Series means there is only one path, so the charge must pass through both resistors in turn. 2. The total resistance of resistors in series is the sum of the individual resistances. 3. Adding gives 4 ohm plus 6 ohm, which is 10 ohm. 4. The answer 2.4 ohm comes from using the parallel rule by mistake, which would lower the resistance instead of raising it. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 17: Electric circuits_