Use Ohm’s law: R = V / I
Measure voltage across the component
Measure current through the component
Divide voltage by current to get resistance
Use a multimeter set to resistance mode
Disconnect power before measuring resistance directly
Place probes across the component terminals
Read the resistance value on the meter
For series circuits, add resistances: Rtotal = R1 + R2 + R3
For parallel circuits, use: 1 / Rtotal = 1 / R1 + 1 / R2 + 1 / R3
Check the resistor color code if applicable
Compare the measured value with the rated value
Account for tolerance when evaluating the result