1. The problem statement, all variables and given/known data In Fig. 28-5a calculate the potential difference across R2, assuming = 14 V, R1 = 6.0 , R2 = 3.0 , and R3 = 2.0. (image isn't working online, but it's a simple circuit- all the resistors are in series) 2. Relevant equations V = IR 3. The attempt at a solution Req = R1 + R2 + R3 = 11 ohms I = V/Req = 14/11 = 1.27 A V = IR1 = 1.27 * 6 = 7.62 V V = IR2 = 1.27 * 3 = 3.81 V So I know the voltage drop across R1 and R2, but I'm confused- what's the difference between calculated voltage drop and the potential difference across the resistor? Many thanks.