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# Kirchoff's Laws/Potential Divider - NEED HELP watch

1. Do resistors in series have the same voltage across them? As I know that resistors in parallel do have the same voltage. Also in which circumstances do we could I use the potential divider formula?
2. Resistors in series share voltage in a ratio based on their resistance. E.g. a 20ohm and a 10ohm resistor would share 12v 8 and 4v respectively.
3. When in series, current is the same, when in parallel, voltage is the same. So you'd only need to use the potential divider formula when in series.

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Updated: May 18, 2015
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