# Help with simple resistor problem

by Mr. Hiyasaki
Tags: resistor, simple
 Emeritus Sci Advisor PF Gold P: 10,427 In your first circuit, begin by combining resistances. Notice that RL is in series with the R above it. Combine those into one resistor, R + RL. Redraw the entire circuit, this time with only one resistor where there once was two, if it'll help you understand. Next, notice that the combined (R + RL) resistor is in parallel with the middle R. You can combine those as: $$\frac{1}{\frac{1}{R} + \frac{1}{R + R_L}}$$ Next, notice that that combination itself is in series with the final R... In this way, you'll combine all the resistances into one equation, which you can then solve for R. - Warren