Physics for IGCSE & O level - Electricity (Section 10 - No. 1)
Which of the following formulas can be used to calculate combined resistance of two resistors in parallel?
R = R1 + R2
R = R1 - R2
1/R = 1/R1 + 1/R2
R = R1 * R2
Explication
The formula for calculating the combined resistance of resistors in parallel is: 1/R = 1/R1 + 1/R2.