2 A $650\U{\Ohm}$ and a $2200\U{\Ohm}$ resistor are connected in series
3 with a $12\U{V}$ battery. What is the voltage across the
4 $2200\U{\Ohm0}$ resistor?
8 First we find the total current in the circuit. The two resistances,
9 $R_1 = 650\U{\Ohm}$ and $R_2 = 2200\U{\Ohm}$, in series provide an
10 effective resistance of $R_e = R_1 + R_2$. By Kirchoff's loop rule
13 I &= \frac{V}{R_e} = \frac{V}{R_1 + R_2}
15 And applying Ohm's law to the second resistor
17 V_2 = I R_2 = \frac{V R_2}{R_1 + R_2} = \ans{9.3\U{V}}