1. The problem statement, all variables and given/known data I performed a lab with a simple DC circuit. The circuit has 4 resistors (i.e. R1, R2, R3 and R4), which is the same as shown in the attached image. When the voltages across all resistors were added, they were higher than the source. How is this possible? The KVL rule states that the voltage across a loop in a circuit should equal zero but no in this case. 2. Relevant equations V=IR 3. The attempt at a solution The lab started off where we had to adjust the power supply until the voltage across R4 was 6V. After measuring the currents and voltages across each resistor, I found that the voltage drop a loop did not add up to what we measured across the source. The voltage drops were greater than the source. For example, the voltage across the source was 19.91 and the total voltage drops across the first loop (E->R1->R2). was 20.072V. My question is how is this possible?