Question

A series combination of two resistors of resistance 12 Ω and 8 Ω is connected across a source of emf 24 V. What is the potential difference across 8 Ω resistors?

9.6 V

14.4 V

20 V

24 V

Answer 1

they're in series so use the series rule to find the total resistance, then V = IR to find the total current

both resistors have the same current since they're in series, so you can then use V = IR on the 8 ohm resistor to find the potential diff.