How to find R_total with R₁ and R₂?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
For series: R_total = R₁ + R₂
For parallel: Use one of these methods:
- General formula: 1/R_total = 1/R₁ + 1/R₂, then R_total = (R₁ × R₂)/(R₁ + R₂)
- Product-over-sum shortcut: R_total = (R₁ × R₂)/(R₁ + R₂)
The product-over-sum method is particularly useful for just two resistors in parallel.
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