Maximum Power Delivered to Load (P_max = E²/(4r) for variable load R matched to source)
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P_max = E²/(4r) for variable load R matched to source internal r (single source)
What each symbol means
| Symbol | What it stands for |
|---|---|
| E | Source EMF (V) |
| P | Power in external load (W) |
| R | Load resistance (Ω) |
| r | Internal resistance (Ω) |
When to use this
Single EMF with series r; variable R; DC steady.