Two resistors, with resistances R and 9R, are connected in series with an AC source. How do their voltages compare?

1. The R resistor has 9 times more voltage than the 9R resistor
2. The 9R resistor has 9 times more voltage than the R resistor
3. The R resistor has more, but not 9 times more
4. The 9R resistor has more, but not 9 times more
5. Their voltages are equal

Because they're in series they have the same current, and V = IR, so the resistor with resistance 9R has 9 times the voltage as the resistor with resistance R.