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Voltage Divider

Two resistors split a voltage: V_out = V_in·R2/(R1+R2). Keep the divider current well above whatever the output feeds, or the load will drag the output down.

Input voltage (V)

R1 (Ω)

R2 (Ω)

Output voltage

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Divider current

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Power burned

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Unloaded ideal divider. A load in parallel with R2 lowers the output — make the divider current ≥10× the load current.

A helper, not a substitute for engineering judgment. Verify against the governing standard.