Divider, Loading & What It Costs

Two resistors, three answers: what it outputs, what it draws, and what it costs you if nobody switches it off.

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Input voltage V

R1, top Ω

R2, bottom Ω

Pack capacity mAh, for the yearly cost

Enter a supply and two resistors, then press Calculate.

From the book — Chapter 4. V_out = V_in × R2 ÷ (R1 + R2). Current = V_in ÷ (R1 + R2). Source impedance = the two in parallel.

The always-on cost is Chapter 4's Engine 3, and it is the one that halves a runtime. Everything stays in your browser — no sign-up, nothing stored.