If the total voltage difference across a set of series resistors is known, the voltage differences across any individual resistor can be determined by the concept of voltage division. In essence, the total voltage across the series combination is divided among the individual resistors; the ratio of the voltage across each individual resistor to the total voltage is the same as the ratio of the resistor to the total resistance. These concepts are used when creating voltage dividers; linear circuits that produce an output voltage (V_{OUT}) that is a fraction of its input voltage (V_{IN}).
For the case of two series resistors, as shown in the figure below, the individual voltages across each resistor can be calculated according to the voltage division formulae below:

Qty  Description  Typical Image  Schematic Symbol  Breadboard Image 

1  1kΩ Resistor  
1  2.2kΩ Resistor  
1  Digital Multimeter (DMM) 
Use V+ to apply 5V voltage across the resistors.
Use the Analog Discovery™ voltmeter or your DMM to measure the voltage difference (V_{OUT}) across the 2.2 kΩ resistor.
Connect V+ (red wire) to the 1 kΩ resistor.
Connect the 2.2 kΩ resistor to the 1 kΩ resistor.
Connect 1+ (orange wire) and 1 (orange and white striped wire) across the 2.2 kΩ resistor, with 1+ on the side closest to V+.
Apply power to the circuit. (Open the voltage instrument, turn on V+.)
Measure the voltage V_{OUT}.
Using the voltage division formula and your measured resistances from part A, calculate the expected output voltage V_{OUT}.
Calculate the percent error between the expected value and the measured value of the voltage. Use the formula below to do this.
\[{\rm{Percent Difference = }}\frac{{{\rm{Measured Value  Expected Value}}}}{{{\rm{Expected Value}}}}x100\]
Change the output voltage to the voltage difference across the 1 k Ω resistor, as shown in the figure below and repeat the steps in part D above.
Use your measured voltages across the 1 kΩ resistor and the 2.2 k Ω resistor to verify KVL.