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Voltage Divider

Two resistors, one tap. See the output voltage, how a load pulls it down, and solve for a resistor pair that hits a target.

Vin 9 VR1 10 kΩR2 10 kΩ4.5 V

Divider

9 V
10 kΩ
10 kΩ

Solve for a target

3.3 V · keeps R2, picks R1
Output voltage
4.5 V
50.0% of Vin
Divider current
450 µA
Output impedance
5 kΩ
R1 ∥ R2
R1 power
2.02 mW
R2 power
2.02 mW