Voltage divider rule for a DC circuit with constant voltage source VT and two resistors with the voltage drop V1 in resistor R1 is given by the formula:

$\displaystyle {V}{1}={V}{T}{\left(\frac{{{R}{1}}}{{{R}{1}+{R}{2}}}\right)}$

Find the voltage source of a circuit with 160 voltate drop in resistor #1 of 40 ohms with a resistor #2 of 30 ohms.

(A) First write an equation you can use to answer this question. Use $\displaystyle {x}$ to represent the voltage source and make sure all expressions are reduced.

The equation is
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(B) Solve your equation in part (A) to find the voltage source.

Answer: Constant voltage source is volts.