How to Calculate Mixed Resistor (Series-Parallel) Connections

✔ Current is Inversely Proportional to Resistance:

$$\\frac{I_1}{I_2} = \\frac{R_2}{R_1}$$

Example Calculation

Three resistors (10Ω, 20Ω, and 30Ω) are connected in parallel to a 12V power source.

✔ Total Resistance Calculation:

$$\\frac{1}{R_{\\text{total}}} = \\frac{1}{10Ω} + \\frac{1}{20Ω} + \\frac{1}{30Ω}$$