How to use the two-source node voltage calculator
Find node voltage of two sources feeding one load. Enter source 1, resistance 1, source 2, resistance 2, load in the fields above; the node voltage, load current are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- V1 — Source 1 (V)
- R1 — Resistance 1 (Ω)
- V2 — Source 2 (V)
- R2 — Resistance 2 (Ω)
- RL — Load (Ω)
Worked example
With source 1 = 12 V, resistance 1 = 2 Ω, source 2 = 6 V, resistance 2 = 3 Ω, load = 4 Ω, the calculator gives node voltage ≈ 7.384615 V; load current ≈ 1.846154 A.
Frequently asked questions
What is the formula for the two-source node voltage calculation?
Node voltage (V) = (V1 / R1+V2 / R2) / (1 / R1+1 / R2+1 / RL). Load current (A) = [Node voltage] / RL. Here V1 is source 1 (V), R1 is resistance 1 (Ω), V2 is source 2 (V), R2 is resistance 2 (Ω), RL is load (Ω).
What inputs do I need for the two-source node voltage calculator?
You need source 1 in V, resistance 1 in Ω, source 2 in V, resistance 2 in Ω, load in Ω. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.